(2S,6R,9S,12R,13S)-12-[(S)-isobutyl]-13-(tert-butyldimethylsilyloxy)-6-[2-(methylthio)ethyl]-2-[(E)-4-(tritylthio)but-1-en-1-yl]-9-tritylthiomethyl-1-oxa-5,8,11-triazacyclopentadecane-4,7,10,15-tetraone

(3R,4S)-allyl 3-(tert-butyldimethylsiloxy)-4-{(S)-2-[(S)-2-[(S,E)-3-(4- methoxybenzyloxy)-7-(tritylthio)hept-4-enoylamino]-4-(methylthio)butanoylamino]-3-tritylthio(propionylamino)}-5-methylhexanoate

(R)-2-[(S,E)-3-(4-methoxybenzyloxy)-7-(tritylthio)hept-4-enamido]propanoic acid

(3S,4R)-allyl 3-(tert-butyldimethylsiloxy)-4-{(S)-2-[(R)-2-[(S,E)-3-(4-methoxybenzyloxy)-7-(tritylthio)hept-4-enoylamino]propionylamino]-3-tritylthio(propionylamino)}-5-methylhexanoate

(3S,4R)-allyl 3-(tert-butyldimethylsiloxy)-4-{(S)-2-[(R)-2-[(S,E)-3-hydroxy-7-(tritylthio)hept-4-enoylamino]propionylamino]-3-tritylthio(propionylamino)}-5-methylhexanoate