benzyl N-[(1R)-1-[[2,4-dibromo-6-[(cyclohexyl-methyl-amino)methyl]phenyl]carbamoyl]-2-[(2R)-2-[[2,4-dibromo-6-[(cyclohexyl-methyl-amino)methyl]phenyl]carbamoyl]-2-phenylmethoxycarbonylamino-ethyl]disulfanyl-ethyl]carbamate