benzyl N-[6,19-bis(acetamidomethylsulfanylmethyl)-9,22-dimethyl-2,5,8, 11,15,18,21,24-octaoxo-25-phenylmethoxycarbonylamino-3,16-dipropyl-1,1 4-dioxa-4,7,10,17,20,23-hexazacyclohexacos-12-yl]carbamate