186256-67-7 204990-60-3 Cryptophycin 52 Cyclo(2,2-dimethyl-beta-alanyl-(2S)-2-hydroxy-4-methylpentanoyl-(2E,5S,6S)-5-hydroxy-6-((2R,3R)-3-phenyloxiranyl)-2-heptenoyl-3-chloro-O-methyl-D-tyrosyl) LY 355703