Heterocyclic compounds of the formula:
wherein
R1 is carboxy or protected carboxy,
R2 is aryl which may have suitable substituent(s),
R3 is aryl which may have suitable substituent(s),
R4 is hydrogen, lower alkyl, hydroxy or aryl,
A1 is lower alkylene,
etc.,
etc. and
n is 0 or 1,
and pharmaceutically acceptable salts thereof which are useful as a medicament.
该式的
杂环化合物:其中R1为羧基或保护羧基,R2为含有适当取代基的芳基,R3为含有适当取代基的芳基,R4为
氢、低
碳基、羟基或芳基,A1为低
碳基亚烷基等,n为0或1,并且其药学上可接受的盐,可用作药物。