A compound of the formula
wherein R1 is a C1-C6 alkyl group and R is a hydrogen atom or a C1-C6 alkyl group, and their salts, which are useful as cerebral vasodilator, and processes for its preparation.
一种
化学式为
式中 R1 为 C1-C6 烷基,R 为氢原子或 C1-C6 烷基的化合物及其盐类,可用作脑血管扩张剂,及其制备方法。