Patent ID: 8350060

Claim:
A 2-amino-bicyclo[3.1.0]hexane-2,6-dicarboxylic ester compound, or a pharmaceutically acceptable salt thereof, represented by formula [I] wherein, R 1 and R 2 are different, and when either one represents a hydrogen atom, the other is a group represented by formula [ii] or, both R 1 and R 2 are represented by formula [ii] X represents a fluorine atom; and Y represents —OCHR 3 R 4 wherein R 3 and R 4 are identical or different, and each represents a hydrogen atom, a C 1-10 alkyl group, a C 2-10 alkenyl group, a phenyl group, a naphthyl group, a naphthyl group substituted by one to seven halogen atoms, or a phenyl group substituted by one to five substituents selected from the group consisting of a halogen atom, a phenyl group, a C 1-10 alkyl group, a C 1-10 alkoxy group, a trifluoromethyl group, a hydroxycarbonyl group, an amino group, a nitro group, a cyano group and a phenoxy group.