Abstract Optically active γ-carboxy-L-glutamic acid was prepared by enantioselective reaction of benzyloxycarbonyl-γ-carboxy-DL-glutamic acid with phenylhydrazine, catalyzed by papain (EC 3.4. 22.2), and subsequent removal of the protecting groups from the obtained benzyloxycarbonyl-γ-carboxy-L-glutamic acid α-phenylhydrazide.
