| 摘要 |
Compounds of formula (I)wherein Rand R, which may be the same or different, each, represent a hydrogen or halogen atom or an alkyl, alkoxy, alkylthio, acyl, alkoxycarbonyl, carboxy, hydroxy, hydroxyalkyl, cyano, nitro, amino, substituted or unsubstituted aminocarbonyl, aminosulphonyl, alkylsulphonylaminoalkyl, N-hydroxycarboximidamide or benzyloxy group; Rrepresents a hydrogen atom or an alkyl, cycloalkyl or cycloalkylalkyl group; Rrepresents a hydrogen atom or a substituted or unsubstituted alkyl group. |
