2,10,12,16,18-Nonadecapentaenoic acid, 19-(3,6-dihydro-3-methyl-6-oxo-2H-pyran-2-yl)-17-ethyl-6-hydroxy-9-(hydroxymethyl)-3,5,7,11,15-pentamethyl-8-oxo- 92090-94-3 94664-05-8 Antibiotic 81-484 Antibiotic CL1957B Kazusamycin Kazusamycin A PD 114721