Patent ID: 7109200

Claim:
A compound represented by the formula: wherein R 1 denotes a group represented by the formula: (wherein Y 1 denotes O, NH, S, CH 2 CH 2 , CH═CH, N═CH, OCH 2 , SCH 2 or two hydrogen atoms), or a group represented by the formula: (wherein Y 2 denotes O, S, N═C or CH═CH), each of which may be substituted, ring A is a ring represented by: wherein n denotes 1 or 2, and m denotes 2 or 3 and may be further substituted, R 2 denotes a hydrogen atom, an optionally substituted C 1-4 alkyl group, an optionally esterified carboxyl group or a cyano group, R 3 denotes a C 1-4 alkyl group or a C 2-4 alkenyl group, each of which may be substituted with a substituent selected from a halogen atom, a hydroxy group, an optionally substituted alkoxy group, an optionally substituted amino group and an optionally esterified carboxyl group, and Z denotes (1) an optionally substituted imidoyl group or an optionally substituted nitrogen-containing heterocyclic group, or a salt thereof.