(2S,9S)-2,9-bis[(2-methylpropan-2-yl)oxycarbonylamino]-13-[1-[(2-methylpropan-2-yl)oxycarbonylamino]ethylideneamino]-8-oxotridecanoic acid;bis(methyl (2S)-6-aminochloranuidyl-2-[(2-methylpropan-2-yl)oxycarbonylamino]hexanoate);methyl (2S,9S)-2,9-bis[(2-methylpropan-2-yl)oxycarbonylamino]-13-[1-[(2-methylpropan-2-yl)oxycarbonylamino]ethylideneamino]-8-oxotridecanoate;methyl (2S)-6-[[(2S,9S)-2,9-bis[(2-methylpropan-2-yl)oxycarbonylamino]-13-[1-[(2-methylpropan-2-yl)oxycarbonylamino]ethylideneamino]-8-oxotridecanoyl]amino]-2-[(2-methylpropan-2-yl)oxycarbonylamino]hexanoate;(2S)-2-[(2-methylpropan-2-yl)oxycarbonylamino]-6-[1-[(2-methylpropan-2-yl)oxycarbonylamino]ethylideneamino]hexanoic acid;sulfane