Patent ID: 7790882

Claim:
A compound represented by the formula (I): wherein ring A is void or a benzene ring optionally having substituent(s), R 1 and R 2 are each independently a phenyl group optionally having substituent(s), a cyclohexyl group, a 2-furyl group or a 3-furyl group, R 3 and R 4 are each independently a hydrogen atom, a halogen atom, a lower alkyl group, a lower alkoxy group, a cycloalkyl group optionally having substituent(s), an aralkyl group optionally having substituent(s) or an aryl group optionally having substituent(s), and X is a residue represented by —OR 5 or —NHR 6 wherein R 5 and R 6 are each a lower alkyl group optionally having substituent(s), an aralkyl group optionally having substituent(s), an aryl group optionally having substituent(s) or a heteroaryl group optionally having substituent(s), wherein each substituent of the benzene ring is independently a halogen atom, a lower alkyl group, a lower alkoxy group, a cycloalkyl group optionally having substituent(s), an aralkyl group optionally having substituent(s), or an aryl group optionally having substituent(s); each substituent of the cycloalkyl group is independently a halogen atom, a lower alkyl group, a lower alkoxy group, a hydroxyl group, an amino group, a nitro group, a cyano group, a carboxyl group, an alkoxycarbonyl group, an aryl group, an aralkyl group, or oxo; each substituent of the phenyl, aryl, aralkyl, and heteroaryl group is independently a halogen atom, a lower alkyl group, a lower alkoxy group, a hydroxyl group, an amino group, a nitro group, a cyano group, a carboxyl group, an alkoxycarbonyl group, an aryl group, or an aralkyl group; and each substituent of the lower alkyl group is independently is a halogen atom, a lower alkoxy group, a hydroxyl group, oxo, an amino group, a nitro group, a cyano group, a carboxyl group, or an alkoxycarbonyl group.