Synonyms: Cyclo[(2R)-2-methyl-b-alanyl-(2S)-2-hydroxy-4-methylpentanoyl-(2E,5S,6S)-5-hydroxy-6-methyl-7-oxo-8-phenyl-2-octenoyl-3-chloro-O-methyl-D-tyrosyl](9CI); Pentanoic acid, 3-chloro-N-[(2E,5S,6S)-5-hydroxy-6-methyl-1,7-dioxo-8-phenyl-2-octenyl]-O-methyl-D-tyrosyl-(2R)-2-methyl-b-alanyl-2-hydroxy-4-methyl-, (3®1)-lactone, (2S)-; Cryptophycin20