abstract |
A 2-amino-bicyclo [3.1.0] hexane-2,6-dicarboxylic ester derivative represented by the formula [II]: wherein X represents fluorine, Y represents 3,4-dichlorobenzyloxy, R2 represents hydrogen and R1 represents an alkyl group selected from methyl, n-propyl and iso-propyl; or a pharmaceutically acceptable salt thereof or a hydrate thereof. |