[S-(R',R')]-2,3-Bis(Benzoyloxy)Butanedioic Acid Compd. With [S-(R',R')]-[1-Ethyl-2-(Phenylmethoxy)Propyl]Hydrazine; (s-(r',r'))-2,3-bis(benzoyloxy)butanedioic acid compd. with (s-(r',r'))-(1-ethyl-2-(phenylmethoxy)propyl)hydrazine; [(2S,3S)-2-(benzyloxy)pentan-3-yl]hydrazine.L-DBTA Salt