コーパス検索結果 (1語後でソート)
通し番号をクリックするとPubMedの該当ページを表示します
1 1,3-diketone moiety masked in the form of an isoxazole.
2 tituents at the 3, 4, and 5 positions of the isoxazole.
3 f the desired 4-alkenyl-3,4,5-trisubstituted isoxazoles.
4 odium vinylcarbenoids across the N-O bond of isoxazoles.
5 of aryl iodides affords 3,4,5-trisubstituted isoxazoles.
6 st-8-en-3-one (10) give predominantly [3,2-c]isoxazoles.
7 (beta,beta,beta-trifluoro-alpha-hydroxyethyl)isoxazoles.
8 n be synthesized in a one-pot procedure from isoxazoles.
9 ew glycosyl triazoles and aryl triazoles and isoxazoles.
10 thiooxoaminothiazoles, and pyrazole-pyrrole-isoxazoles.
11 -methyl-1H-benzotriazole 5, 3-methyl-benzo[d]isoxazole 3, and 3-methyl-[1,2,4]triazolo[4,3-a]pyridine
13 ely N-phenyl-5-(2-(p-tolylamino)thiazol-4-yl)isoxazole-3-carboxamide 7a and N-(pyridin-2-yl)-5-(2-(p-
14 yridin-2-yl)-5-(2-(p-tolylamino)thiazol-4-yl)isoxazole-3-carboxamide 8a, were found to show high inhi
15 l- N-pyrazol-4-yl-4,5,6,7-tetrahydrobenzo[ d]isoxazole-3-carboxamide derivatives as novel potent Myco
16 potent 5-(2-methylbenzothiazol-5-yloxymethyl)isoxazole-3-carboxamide derivatives, which proved to be
17 8-bis(trifluoromethyl)quinolin-4-yloxymethyl)isoxazole-3-carboxylic acid ethyl ester (compound 3) wit
18 ough 5-HT(2A) and/or 5-HT(2C) receptors, the isoxazoles 3d and 4d constitute interesting leads for fu
21 ne, 105 degrees C) leads to the formation of isoxazole-4-carboxylic esters and amides in good yields.
22 activation of alpha-amino-3-hydroxy-5-methyl-isoxazole-4-propionate/kainate (AMPA/KA) and NMDA recept
23 necrotically in an -amino-3-hydroxy-5-methyl-isoxazole-4-propionic acid (AMPA) receptor-dependent man
24 C termini of alpha-amino-3-hydroxy-5-methyl-isoxazole-4-propionic acid (AMPA) receptors in vitro and
25 artic acid or alpha-amino-3-hydroxy-5-methyl-isoxazole-4-propionic acid (AMPA)-subtype glutamate rece
27 postsynaptic alpha-amino-3-hydroxy-5-methyl-isoxazole-4-propionic acid receptors (AMPARs) prevents L
28 mpal neurons, alpha-amino-3-hydroxy-5-methyl-isoxazole-4-propionic acid subtype glutamate receptor (A
29 ate), AMPA (alpha-amino-3-hydroxy-5-methyl-4-isoxazole-4-propionic acid) and kainate receptors; criti
31 for agonist (alpha-amino-3-hydroxy-5-methyl-isoxazole-4-propionic acid)-initiated rapid proteolytic
32 The isoxazol-3-one tautomer of the bicyclic isoxazole, 5,6,7,8-tetrahydro-4H-isoxazolo[4,5-d]azepin-
35 evious work with a synthetic small molecule, isoxazole 9 (Isx-9), highlighted its neuronal-differenti
38 injury, and treatment of dermal wounds with isoxazole accelerates wound closure and suppresses the i
39 itor (S,R)-3-(4-hydroxyphenyl)-4,5-dihydro-5-isoxazole acetic acid methyl ester (ISO-1) inhibited huM
40 d to (S,R)-3-(4-hydroxyphenyl)-4,5-dihydro-5-isoxazole acetic acid methyl ester (ISO-1), an inhibitor
41 y of (S,R)-3-(4-hydroxyphenyl)-4,5-dihydro-5-isoxazole acetic acid methyl ester (ISO-1), an orally bi
43 nist (S,R)-3-(4-hydroxyphenyl)-4,5-dihydro-5-isoxazole acetic acid methyl ester considerably attenuat
44 O-1 ((S,R)-3-(4-hydroxyphenyl)-4,5-dihydro-5-isoxazole acetic acid methyl ester)," significantly inhi
45 nctionality of UPOC methyl ester with a free isoxazole acid using HBTU or alternatively an isoxazole
47 d N,N-dialkylamino-3-aryl/alkyl-4-(2-R-vinyl)isoxazoles afford 2-aryl/alkyl-5-aryl/alkyl/methoxycarbo
48 urine BIIB021, and the resorcinylic pyrazole/isoxazole amide compounds VER-49009, VER-50589, and NVP-
49 operties of NVP-AUY922, a novel resorcinylic isoxazole amide heat shock protein 90 (HSP90) inhibitor.
50 (NMDA) and alpha-amino-3-hydroxy-5-methyl-4-isoxazole (AMPA) glutamate receptors across the lifespan
53 cloaddition strategy to append five membered isoxazole and isoxazolone as new phytochemical entities
55 r isosteric replacement of alkyl-substituted isoxazole and pyrazole was shown by the synthesis of flu
57 ways under VNS conditions, one leading to an isoxazole and the other resulting in the formal cyclopro
58 tituted isoxazole was then conducted with 56 isoxazole and triazole derivatives prepared using "click
59 ccess to stable MIDA boronate-functionalized isoxazoles and triazoles and their subsequent efficient
60 thiophene, furan, pyridine, indole, oxazole, isoxazole, and benzoxazole, are effective in this chemis
63 which the central furan ring is replaced by isoxazole-and 42 novel analogues were prepared by two ge
66 ed isomerization of the so-formed mixture of isoxazole/azirine-substituted biacetylenic intermediates
67 of cell or tissue lysates to a biotinylated isoxazole (b-isox) chemical precipitated hundreds of RNA
72 dy, we have continued our efforts to develop isoxazole-based anti-TB compounds by applying rational d
74 t both compounds 5 and 10 do not give [3,2-c]isoxazoles but rather afford regioselectively [2,3-d]iso
75 ral elaborations of these highly substituted isoxazoles by SN Ar reactions and hydrogenolysis allows
79 5-methyl-1-(piperidin-4-yl)-1H-pyrrazol-4-yl)isoxazole (CMPI) has been identified as a PAM selective
80 proven general with a range of carbenoid and isoxazole components and represents a unique disconnecti
83 y to investigate the effects of one of these isoxazole compounds, WJ352, on the conformation of the S
84 select resistance against a newly developed isoxazole-conjugated adamantane inhibitor that targets t
89 reaction routes on substituents at starting isoxazole core and reaction conditions are discussed on
90 o(-bromo or -methyl)furan-2-yl groups on the isoxazole core was essential for their selectivity towar
91 ble, and the thermodynamic 3,5-disubstituted isoxazole could be obtained by isomerization of its 3,4-
92 caffold Hsp90 inhibitor CNF2024/BIIB021, the isoxazole derivative VER-52296/NVP-AUY922, and the carba
93 (PM226)], a selective and potent CB2 agonist isoxazole derivative, was tested in the acute phase of T
97 1600-fold and only leads to formation of the isoxazole end product (the result of the transaminase pa
98 y, a new series of nAChR ligands based on an isoxazole-ether scaffold have been designed and synthesi
100 rocyclic framework (the anthranil or benzo[c]isoxazole framework) is formed as the result of diversio
101 f the AMPA (alpha-amino-3-hydroxy-5-methyl-4-isoxazole) glutamate receptor subunit GluR2 in the nucle
102 hat K18, which contains a 3-(dichlorophenyl)-isoxazole group connected through carbonyloxycarboximida
105 comparison to its 5-regioisomer, the 3-amino-isoxazole group was combined with the optimal 2'-substit
114 ed to the identification of 3-amino benzo[ d]isoxazoles, incorporating a N, N'-diphenyl urea moiety a
116 rocess is presented, which directly converts isoxazoles into their oxazole counterparts via a photoch
120 based organocatalysis for the preparation of isoxazole/isoxazoline moieties in an environmentally ben
122 ied a family of neurogenic 3,5-disubstituted isoxazoles (Isx) that increased expression of neurogenic
123 d 2-aminopyridines, imidazoles, oxazoles, or isoxazoles leads to the incorporation of the [B-C] motif
124 A heterocyclic thiophene moiety (103) and an isoxazole moiety (108) were incorporated as isosteric re
125 rtant one involves the transformation of the isoxazole moiety into a carboxylic acid group, thus open
126 phenyl ring as well as the 5-position of the isoxazole moiety may allow for the development of more p
127 , we reported on a series of isoxazoline and isoxazole monobasic noncovalent inhibitors of factor Xa
128 oward either 3- or 5-fluoroalkyl-substituted isoxazoles or pyrazoles containing an additional functio
129 ndensation with benzamidoxime gave the final isoxazole-oxadiazole diheterocyclic product in good yiel
130 lecules containing two different heteroatoms isoxazole, oxazole, and thiazole on Si(111)-7 x 7 was st
131 ecules containing two different heteroatoms (isoxazole, oxazole, and thiazole) and of the aromatic mo
133 th hydrolytically stable, fused isoxazolone, isoxazole, oxazolone, or cyano substituents on the aroma
135 stematic evaluation of a novel cycloalkane[d]isoxazole pharmacophoric fragment-containing androgen re
139 oxygen on the electrophilic amine to produce isoxazole products, as compared to the previous reportsa
141 type of the alpha-amino-3-hydroxy-5-methyl-4-isoxazole propionate (AMPA) receptor in mice disrupts th
142 king of the alpha-amino-3-hydroxy-5-methyl-4-isoxazole propionate (AMPA) receptor subunits GluA1 and
143 nalysis for alpha-amino-3-hydroxy-5-methyl-4-isoxazole propionate (AMPA) receptor subunits GluR2 and
144 mediated by alpha-amino-3-hydroxy-5-methyl-4-isoxazole propionate (AMPA) receptors (AMPARs) and is Ca
145 by NMDA and alpha-amino-3-hydroxy-5-methyl-4-isoxazole propionate (AMPA) receptors in hippocampal pyr
147 utamate and alpha-amino-5-methyl-3-hydroxy-4-isoxazole propionate (AMPA)) and a partial agonist (kain
148 family, namely, a-amino-3-hydroxy-S-methyl-4-isoxazole propionate (AMPA), kainate, and N-methyl-d-asp
149 erations to alpha-amino-3-hydroxy-5-methyl-4-isoxazole propionate (AMPA)-type glutamate receptors cau
150 ate binding alpha-amino-5-methyl-3-hydroxy-4-isoxazole propionate and kainate subtypes of the ionotro
151 ion of the alpha-amino-3-hydroxyl-5-methyl-4-isoxazole propionate receptor (AMPAR) subunit 1 (GluR1),
153 plasticity, alpha-amino-3-hydroxy-5-methyl-4-isoxazole propionate receptors (AMPA-Rs) with an electro
154 ts of AMPA (alpha-amino-3-hydroxy-5-methyl-4-isoxazole propionate) glutamate receptors in the nucleus
155 it of AMPA (alpha-amino-3-hydroxy-5-methyl-4-isoxazole propionate) receptor mediates two dynamic chan
157 olution the alpha-amino-5-methyl-3-hydroxy-4-isoxazole propionate-bound form of this mutant exists pr
158 rtate-type, alpha-amino-3-hydroxy-5-methyl-4-isoxazole propionate-type, and metabotropic-type glutama
159 e glutamate alpha-amino-3-hydroxy-5-methyl-4-isoxazole propionate/kainate receptor antagonist CNQX (0
161 ters of the alpha-amino-3-hydroxy-5-methyl-4-isoxazole-propionate (AMPA) receptors or the postsynapti
165 receptors, alpha-amino-3-hydroxyl-5-methyl-4-isoxazole-propionate (AMPA), and N-methyl-d-aspartic aci
166 regulated alpha-amino-3-hydroxyl-5-methyl-4-isoxazole-propionate (AMPA)-induced GluR1 and GluR2 inte
167 NMDAR) and alpha-amino-3-hydroxyl-5-methyl-4-isoxazole-propionate receptor (AMPAR) are ionotropic glu
168 reases the alpha-amino-3-hydroxyl-5-methyl-4-isoxazole-propionate receptor (AMPAR)-mediated contribut
169 /NR2b) and alpha-amino-3-hydroxyl-5-methyl-4-isoxazole-propionate receptors (AMPA-R) (GluR1/GluR2) se
170 ediated by alpha-amino-3-hydroxyl-5-methyl-4-isoxazole-propionate receptors (AMPARs) and N-methyl-d-a
171 -permeable alpha-amino-3-hydroxyl-5-methyl-4-isoxazole-propionate receptors (AMPARs) in the lateral a
172 osition of alpha-amino-3-hydroxyl-5-methyl-4-isoxazole-propionate receptors (AMPARs) is an important
173 mplex with alpha-amino-3-hydroxyl-5-methyl-4-isoxazole-propionate receptors (AMPARs), the major excit
174 containing alpha-amino-3-hydroxyl-5-methyl-4-isoxazole-propionate receptors (GluR1-AMPARs) are implic
177 tion, AMPA (alpha-amino-3-hydroxy-5-methyl-4-isoxazole-propionate)-preferring and kainate (KA)-prefer
178 subunits of alpha-amino-3-hydroxy-5-methyl-4-isoxazole-propionate-preferring, kainate-preferring, and
179 , acting at alpha-amino-3-hydroxy-5-methyl-4-isoxazole propionic acid (AMPA) -selective and kainate-s
180 tio between alpha-amino-3-hydroxy-5-methyl-4-isoxazole propionic acid (AMPA) and N-methyl-D-aspartate
181 VGCCs), the alpha-amino-3-hydroxy-5-methyl-4-isoxazole propionic acid (AMPA) class of glutamate recep
182 competitive alpha-amino-3-hydroxy-5-methyl-4-isoxazole propionic acid (AMPA) glutamate receptor antag
183 ceptors for alpha-amino-3-hydroxy-5-methyl-4-isoxazole propionic acid (AMPA) in the nucleus accumbens
184 ocked by the alpha-amino-3-hydoxy-5-methyl-4-isoxazole propionic acid (AMPA) receptor antagonist 6-ni
185 ansmembrane alpha-amino-3-hydroxy-5-methyl-4-isoxazole propionic acid (AMPA) receptor regulatory prot
186 full-length alpha-amino-5-methyl-3-hydroxy-4-isoxazole propionic acid (AMPA) receptor structure (1).
187 ulations of alpha-amino-3-hydroxy-5-methyl-4-isoxazole propionic acid (AMPA) receptor-active and inac
188 r 3 (GluR3) alpha-amino-3-hydroxy-5-methyl-4-isoxazole propionic acid (AMPA) receptors (WT GluR3) and
189 e number of alpha-amino-3-hydroxy-5-methyl-4-isoxazole propionic acid (AMPA) receptors are proportion
190 by blocking alpha-amino-3-hydroxy-5-methyl-4-isoxazole propionic acid (AMPA) receptors impaired both
191 ribution of alpha-amino-3-hydroxy-5-methyl-4-isoxazole propionic acid (AMPA) receptors to the control
192 ors of the alpha-amino-3-hydroxyl-5-methyl-4-isoxazole propionic acid (AMPA) subtype and has been lin
193 (NMDA) and alpha-amino-3-hydroxy-5-methyl-4-isoxazole propionic acid (AMPA) subtypes of glutamate re
194 morphology, alpha-amino-3-hydroxy-5-methyl-4-isoxazole propionic acid (AMPA) to N-methyl-D-aspartate
195 ture of the alpha-amino-3-hydroxy-5-methyl-4-isoxazole propionic acid (AMPA)-sensitive, homotetrameri
196 lization of alpha-amino-3-hydroxy-5-methyl-4-isoxazole propionic acid (AMPA)-type glutamate receptors
197 hibition of alpha-amino-3-hydroxy-5-methyl-4-isoxazole propionic acid (AMPA)-type glutamate receptors
200 A)-type and alpha-amino-3-hydroxy-5-methyl-4-isoxazole propionic acid (AMPA)-type glutamate receptors
203 asticity of alpha-amino-3-hydroxy-5-methyl-4-isoxazole propionic acid and N-methyl-D-aspartate recept
204 1 and GluA2 alpha-amino-3-hydroxy-5-methyl-4-isoxazole propionic acid receptor (AMPAR) and GluN1 N-me
205 ly modulate alpha-amino-3-hydroxy-5-methyl-4-isoxazole propionic acid receptor (AMPAR) clustering and
206 (NMDAR) and alpha-amino-3-hydroxy-5-methyl-4-isoxazole propionic acid receptor (AMPAR) properties to
207 tion of the alpha-amino-3-hydroxy-5-methyl-4-isoxazole propionic acid receptor (AMPAR) subunit, GluR1
208 hippocampal alpha-amino-3-hydroxy-5-methyl-4-isoxazole propionic acid receptor (AMPAR) trafficking, a
210 cts require alpha-amino-3-hydroxy-5-methyl-4-isoxazole propionic acid receptor activation and are blo
212 but not the alpha-amino-3-hydroxy-5-methyl-4-isoxazole propionic acid receptor subunit GluR2, were co
213 s of AMPAR (alpha-amino-3-hydroxy-5-methyl-4-isoxazole propionic acid receptor)-mediated currents fol
214 ation of an alpha-amino-3-hydroxy-5-methyl-4-isoxazole propionic acid receptor-positive modulator imp
215 -permeable) alpha-amino-3-hydroxy-5-methyl-4-isoxazole propionic acid receptors (AMPAR) in the hippoc
217 -containing alpha-amino-3-hydroxy-5-methyl-4-isoxazole propionic acid receptors (AMPARs) in spines.
218 )-permeable alpha-amino-3-hydroxy-5-methyl-4-isoxazole propionic acid receptors (AMPARs) in the hippo
219 , including alpha-amino-3-hydroxy-5-methyl-4-isoxazole propionic acid receptors (AMPARs), are believe
223 NMDAR but not alpha-amino-3-hydroxy-methyl-4-isoxazole propionic acid receptors was also increased.
225 Glutamate, alpha-amino-3-hydroxy-5-methyl-4-isoxazole propionic acid with cyclothiazide, and thapsig
227 ffinity AMPA (alpha-amino-3-hydroxy-5-methyl isoxazole propionic acid) and kainate glutamate receptor
228 d rat AMPA (alpha-amino-3-hydroxy-5-methyl-4-isoxazole propionic acid) and kainate receptor subtypes
229 f the AMPA (alpha-amino-3-hydroxy-5-methyl-4-isoxazole propionic acid) glutamate receptor (AMPAR).
231 o of AMPA (alpha-amino-3-hydroxy-5-methyl-4- isoxazole propionic acid) receptor- to NMDA (N-methyl-d-
232 eable AMPA (alpha-amino-3-hydroxy-5-methyl-4-isoxazole propionic acid) receptors (AMPARs), activated
233 on of AMPA (alpha-amino-3-hydroxy-5-methyl-4-isoxazole propionic acid) receptors, a subtype of glutam
234 aptic AMPA (alpha-amino-3-hydroxy-5-methyl-4-isoxazole propionic acid) receptors, thereby strengtheni
237 tion of AMPA (alpha-amino-3-hydroxy-5-methyl-isoxazole propionic acid)-receptor-mediated currents at
238 uced an AMPA (alpha-amino-3-hydroxy-5-methyl-isoxazole propionic acid)-receptor-mediated increase in
239 of an AMPA (alpha-amino-3-hydroxy-5-methyl-4-isoxazole propionic acid)-subtype iGluR in explicit wate
241 ereas AMPA (alpha-amino-3-hydroxy-5-methyl-4-isoxazole propionic acid)/kainate receptor subunits were
242 eable AMPA (alpha-amino-3-hydroxy-5-methyl-4-isoxazole propionic acid)/kainate receptors alone or by
243 unit of the alpha-amino-3-hydroxy-5-methyl-4-isoxazole propionic acid-type glutamate receptor, Ser94
244 lization of alpha-amino-3-hydroxy-5-methyl-4-isoxazole propionic acid-type glutamate receptors (AMPAR
247 phology and alpha-amino-3-hydroxy-5-methyl-4-isoxazole propionic acid/N-methyl-D-aspartate glutamate
248 ses in both alpha-amino-3-hydroxy-5-methyl-4-isoxazole propionic acid/N-methyl-D-aspartate glutamate
249 intra-NASh alpha-amino-3-hydroxy-5-methyl-4-isoxazole propionic acid/N-methyl-D-aspartate receptor t
250 receptors (alpha-amino-3-hydroxy-5-methyl-4-isoxazole propionic acid; AMPA-Rs) purified from rat bra
251 delivery of alpha-amino-3-hydroxy-5-methyl-4-isoxazole propionic-type receptors (AMPARs) to synapses,
253 nists on (S)-2-amino-3-(3-hydroxy-5-methyl-4-isoxazole) propionic acid (AMPA) receptors but neverthel
254 The (S)-2-amino-3-(3-hydroxy-5-methyl-4-isoxazole)propionic acid (AMPA)-subtype glutamate recept
255 NR2A/B) and alpha-amino-3-hydroxy-5-methyl-4-isoxazole-propionic acid (AMPA) (GluR1 and GluR2) subuni
256 tor and the alpha-amino-3-hydroxy-5-methyl-4-isoxazole-propionic acid (AMPA) receptor in the dorsal,
257 subunit of alpha-amino-3-hydroxy-5-methyl-4-isoxazole-propionic acid (AMPA) receptors is implicated
258 ferences in alpha-amino-3-hydroxy-5-methyl-4-isoxazole-propionic acid receptor (AMPAR) subunit expres
259 gulation of alpha-amino-3-hydroxy-5-methyl-4-isoxazole-propionic acid receptor (AMPAR) subunits in th
260 function of alpha-amino-3-hydroxy-5-methyl-4-isoxazole-propionic acid receptors, and, more recently,
262 partate and alpha-amino-3-hydroxy-5-methyl-4-isoxazole-propionic acid) and metabotropic glutamate (mG
263 icostriatal alpha-amino-3-hydroxy-5-methyl-4-isoxazole-propionic acid-type glutamate receptor-mediate
264 ng to NMDA, alpha-amino-3-hydroxy-5-methyl-4-isoxazole-proprionate (AMPA), and kainate receptors in b
265 unit of the alpha-amino-3-hydroxy-5-methyl-4-isoxazole proprionic acid (AMPA) receptor failed to reve
266 n inhibited alpha-amino-3-hydroxy-5-methyl-4-isoxazole proprionic acid (AMPA) receptor-mediated synap
267 tion of the alpha-amino-3-hydroxy-5-methyl-4-isoxazole proprionic acid (AMPA)/KA receptor agonist KA
274 ion reaction was developed, allowing for the isoxazole ring opening and global deprotection to be ach
275 its active metabolite teriflunomide through isoxazole ring opening has been monitored in vitro using
276 ed aldehyde, aminocarbonyl, cyano groups, or isoxazole ring) with thiol salts were investigated.
278 mode involving Mo(CO)(6)-mediated reductive isoxazole ring-opening, Mo(CO)(6)-catalyzed cis-trans-is
279 which have no substituent on the 2beta-(1,2-isoxazole) ring, all compounds were selective for the DA
280 tion of "atom replacement" mimetics in which isoxazole rings linked by thioethers mimic the alternati
283 n the synthesis of 5-fluoroalkyl-substituted isoxazoles starting from functionalized halogenoximes is
285 ip (SAR) analysis revealed that the aromatic isoxazole substituent in the southern part regulates the
286 ime in the presence of bleach) to afford the isoxazole-substituted carboxylic acid methyl ester.
288 aldehydes are converted to fused tetracyclic isoxazoles through a synthetic sequence incorporating su
289 the domino isomerization, transformation of isoxazole to 2H-azirine, which is compatible with Ph3PAu
291 zirines isomerize quantitatively either into isoxazoles under catalytic conditions (dioxane, 105 degr
292 approach for the synthesis of functionalized isoxazoles via palladium-catalyzed cascade annulation/al
293 = 221 nm, in addition to this decomposition, isoxazole was also found to isomerize into several produ
294 ationship analysis of this 3,5-disubstituted isoxazole was then conducted with 56 isoxazole and triaz
295 ds based on amantadine- and aryl-substituted isoxazole were discovered to inhibit the S31N channel ac
296 d in two steps from the corresponding [2,3-d]isoxazole, which is interesting from the perspective of
297 hira coupling of 5-methoxy-4-(prop-2-yn-1-yl)isoxazoles with 6-bromonicotinates to give methyl 6-(3-(
298 nton reaction of 5-methoxy-4-(prop-2-yn-1-yl)isoxazoles with Cu(OAc)(2), followed by Fe(NTf(2))(2)/Au
300 lucuronidated less than previously described isoxazoles, yielding higher drug levels in human cancer