| 摘要 |
A compound of the formula: <IMAGE> 1 wherein: X, Y and Z, independently, are hydrogen, halogen, hydroxy, nitro, cyano, carboxyl, trifluoromethyl, phenyl, amino, mono and di-alkylamino, C1-C12 alkyl or C1-C12 alkoxy; R1 is hydrogen, C1-C18 saturated or unsaturated alkyl, cycloalkyl, phenyl, benzyl or substituted benzyl where the substituents are C1-C12 alkyl, or C1-C12 alkoxy; and R2 is represented by 2. <IMAGE> 2 in which X, Y, and Z are defined above; or a pharmaceutically acceptable salt thereof.
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