12R-isopropyl-6R-methyl-13S-triisopropylsilanyloxy-2R-[4-(triphenyl-λ-sulfanyl)but-1E-enyl]-9S-tritylsulfanylmethyl-1-oxa-5,8,11-triazacyclopentadecane-4,7,10,15-tetraone

4R-{2S-[2-(3S-hydroxy-7-tritylsulfanylhept-4E-enoylamino)propionylamino]-3-tritylsulfanylpropionylamino}-5R-methyl-3S-triisopropylsilanyloxyhexanoic acid

4R-{2S-[2-(3S-hydroxy-7-tritylsulfanylhept-4E-enoylamino)propionylamino]-3-tritylsulfanylpropionylamino}-5R-methyl-3S-triisopropylsilanyloxyhexanoic acid 2,2,2-trichloroethyl ester

epi-4R-{2S-[2-(3R-hydroxy-7-tritylsulfanylhept-4E-enoylamino)propionylamino]-3-tritylsulfanylpropionylamino}-5R-methyl-3S-triisopropylsilanyloxyhexanoic acid 2,2,2-trichloroethyl ester