145458-91-9 5-Methyl-7-(2'-(2''-methylpropionyloxy)-3'-acetoxy)butylidene-1a,2,3,7-tetrahydrocyclopent(b)oxireno(c)pyridine Kobutimycin A Propanoic acid, 2-methyl-, 2-(acetyloxy)-1-((2,3-dihydro-5-methylcyclopent(b)oxireno(c)pyridin-7(1aH)-ylidene)methyl)propyl ester, (Z)-(+)-