S-benzyl-N-(N,N-phthaloyl-glycyl)-L-cystein-ethyl ester
S-benzyl-N-(N2-benzyloxycarbonyl-L-glutaminyl)-L-cysteine ethyl ester
N-Carbobenzoxytyrosyl-S-benzylcysteine ethyl ester
N-Isopropyl-S-benzyl-L-Cys
N-<3-(acetylthio)-2(R)-(phenylmethyl)-1-oxopropyl>-S-(phenylmethyl)-L-cysteine ethyl ester