| abstract |
The object of the present invention is to provide an optically active bicyclic γ-amino acid derivative in high purity. This object can be achieved by a mixture of compounds represented by general formula (I) and (I'), or a method for preparing a compound represented by general formula (VII) or a salt thereof via compound (I): [Formula 1] Wherein R 1 and R 2 each represent a group selected from C1-6 alkyl and the like, and R 3 represents a cyano group and the like. [Formula 2] |