Patent ID: 7417059

Claim:
A compound of the formula: wherein R 1 is a group of the formula: OR 1a wherein R 1a is a C 1-6 alkyl group; X is a methylene group, —NH—, a sulfur atom or an oxygen atom; Y is a methylene group or —NH—, each of which optionally has C 1-6 alkyl group(s); and ring A is a 6-membered ring optionally substituted further by 1 to 4 substituent(s) selected from a C 1-6 alkyl group, a phenyl group and a halogen atom; Ar is a C 6-14 aryl group optionally having substituent(s) selected from the group consisting of halogen atom, C 1-4 alkyl group, C 1-4 alkoxy group, C 1-4 alkoxy-carbonyl group, carboxyl group, nitro group, cyano group, hydroxy group, C 1-4 alkanoylamino group, C 3-6 cycloalkyl group, C 6-10 aryl group, halogeno C 1-4 alkyl group, halogeno C 1-4 alkoxy group, C 1-4 alkylthio group, C 1-4 alkylsulfonyl group, C 1-4 alkanoyl group, 5-membered aromatic heterocyclic group, carbamoyl group, C 1-4 alkyl-carbamoyl group, C 1-4 alkoxy-carbonyl-C 1-4 alkyl-carbamoyl group and 1,3-diacylguanidino-C 1-4 alkyl group; or a salt thereof and; with the proviso that the group of the formula: is a group of the formula: and further provided that when X is a methylene group, Y is a methylene group optionally substituted with C 1-6 alkyl group(s).