| 摘要 |
Compounds of general formula (1), or a pharmaceutically acceptable salt thereof: wherein R1 is selected from H, lower alkyl, R4-CO, R4-O2CCH2, R5-OCO and R5-SO2; R2 is selected from lower alkyl, cycloalkyl optionally substituted with an alkyl or alkyloxy group, (C5-C12)cycloalkylalkyl optionally substituted with an alkyl or alkyloxy group, aralkyl optionally substituted with up to three groups chosen from F, CI, Br, I, OH, lower alkyl, O-(lower alkyl), O-benzyl, NH2, NO2, NH-acyl, CN and CF3, and aralkyloxymethyl optionally substituted with up to three groups chosen from F, CI, Br, OH, lower alkyl and O-(lower alkyl); or R1 and R2 together are an o-xylylene group optionally substituted on the aromatic ring with a group selected from F, CI, Br, OH, lower alkyl and O-(lower alkyl); R3 is selected from H, OH and O-lower alkyl; R4 is selected from H, lower alkyl and phenyl; and R5 is selected from lower alkyl, phenyl and benzyl. The compounds are useful as pharmaceutical compositions.
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