[C:1]([NH:9][CH:10]([S:19][C:20](=[O:27])[C:21]1[CH:26]=[CH:25][CH:24]=[CH:23][CH:22]=1)[C:11]([NH:13][C@H:14]([C:16]([OH:18])=[O:17])C)=[O:12])(=[O:8])[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1>C(OCC)C>[C:1]([NH:9][CH:10]([S:19][C:20](=[O:27])[C:21]1[CH:26]=[CH:25][CH:24]=[CH:23][CH:22]=1)[C:11]([NH:13][CH2:14][C:16]([OH:18])=[O:17])=[O:12])(=[O:8])[C:2]1[CH:3]=[CH:4][CH:5]=[CH:6][CH:7]=1N-[N-Benzoyl-α-(benzoylthio)-glycyl]-alanine, in the form of a diastereomer mixture, melting point 162°-164° C. (diethyl ether), Rf=0.47 and 0.40 in system I.
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