| 摘要 |
A compound of formula (I) wherein R1 is hydroxy or NHSO2R1A wherein R1A is (C1-8)alkyl, (C3-7)cycloalkyl or {(C1-6)alkyl-(C3-7)cycloalkyl}, which are all optionally substituted from 1 to 3 times with halo, cyano, nitro, O-(C1-6)alkyl, amido, amino or phenyl, or R1A is C6 or C10 aryl which is optionally substituted from 1 to 3 times with halo, cyano, nitro, (C1-6)alkyl, O-(C1-6)alkyl, amido, amino or phenyl; R2 is t-butyl, -CH2-C(CH3)3, or -CH2-cyclopentyl; R3 is t-butyl or cyclohexyl and R4 is cyclobutyl, cyclopentyl, or cyclohexyl; or a pharmaceutically acceptable salt thereof.
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