A Mixture of Type A, B, and C [(S)-1-Carboxy-2-Phenylethyl]Carbamoyl-alpha- [2-Iminohexahydro-4(S)-Pyrimidyl]-(S)-Glycyl-X-Phenylalaninal X: L-Leu (Type A), L-Val (Type B), L-Ile (Type C) [9076-44-2] Microbial Product Inhibitor for Chymotrypsin, Papain, and Cathepsin B/G *Purity of this compound is provided at a level of around 50%. H. Umezawa, T. Aoyagi, H. Morishima, S. Kunimoto, M. Matsuzaki, M. Hamada, and T. Takeuchi, J. Antibiotics, 23, 425 (1970). (Original) K. Tatsuta, N. Mikami, K. Fuji