Synonyms: DestruxinB, 1-L-2-piperidinecarboxylic acid-;2H-Pyrido[1,2-d][1,4,7,10,13,16]oxapentaazacyclononadecine, cyclic peptidederiv.; Cyclo[N-methyl-L-alanyl-b-alanyl-(2R)-2-hydroxy-4-methylpentanoyl-(2S)-2-piperidinecarbonyl-L-isoleucyl-N-methyl-L-valyl]