(2S,6R,9S,12R,13S)-12-((S)-sec-butyl)-13-hydroxy-6-methyl-2-[(E)-4-tritylthio-1-butenyl]-9-tritylthiomethyl-1-oxa-5,8,11-triaza-cyclopentadecane-4,7,10,15-tetraone

(E)-(S)-3-hydroxy-1-[(R)-4-isopropyl-5,5-diphenyl-2-oxo-oxazolidin-3-yl]-7-tritylthio-4-hepten-1-one

allyl (3S,4R,5S)-4-((tert-butoxycarbonyl)amino)-3-hydroxy-5-methylheptanoate

allyl (3S,4R,5S)-4-[(S)-2-{(R)-2-[(E)-(S)-3-hydroxy-7-(tritylthio)-4-heptenoylamino]propionylamino}-3-(tritylthio)propionylamino]-3-hydroxy-5-methylheptanoate