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

(2E)-5-[(triphenylmethyl)thio]-2-pentenal

(3S,4R)-4-(tert-butoxycarbonylamino)-3-hydroxy-5-methylhexanoic acid methyl ester

(3S,4E)-3-hydroxy-1-((4R)-4-isopropyl-2-thioxothiazolidin-3-yl)-7-tritylsulfanyl-hept-4-en-1-one

4R-[2-(9H-fluoren-9-ylmethoxycarbonylamino)-3S-tritylsulfanylpropionylamino]-3S-hydroxy-5-methylhexanoic acid 2,2,2-trichloroethyl ester