UMWANDLUNG VON CYSTEINYLSERIN IN LANTHIONIN

N-Benzyloxycarbonyl-S-benzoyl-l-cysteinyl-O-benzoyl-L-serine methyl ester is transformed to N-benzyloxycarbonyl derivatives of cyclo-l-lanthionyl methyl ester and of cyclo-meso-lanthionyl methyl ester.