(E)-(5S,6S,7R,8R)-5-[(S)-2-((R)-3-tert-Butoxycarbonylamino-2-methyl-propionyloxy)-4-methyl-pentanoylamino]-8-(tert-butyl-dimethyl-silanyloxy)-7-hydroxy-6-methyl-8-phenyl-oct-2-enoic acid allyl ester

cryptophycin 226