1-Pyrrolidinecarboxylic acid,2-[[[(3S,5R)-5-[[(3-amino-3-iminopropyl)amino]carbonyl]-1-[(phenylmethoxy)carbonyl]-3-pyrrolidinyl]amino]carbonyl]-4-[[[(2R,4S)-4-(formylamino)-1-[(phenylmethoxy)carbonyl]-2-pyrrolidinyl]carbonyl]amino]-,phenylmethyl ester, (2