p. 2348 - 2351
(1966)(S)-4-{2-[(R)-2-(2-Acetylamino-acetylamino)-3-(4-methyl-benzylsulfanyl)-propionylamino]-acetylamino}-4-[(S)-3-carbamoyl-1-((S)-1-carboxy-2-methylcarbamoyl-ethylcarbamoyl)-propylcarbamoyl]-butyric acid benzyl ester
(S)-4-Amino-4-[(S)-3-carbamoyl-1-((S)-1-carboxy-2-methylcarbamoyl-ethylcarbamoyl)-propylcarbamoyl]-butyric acid benzyl ester