Showing structure for n-[5-({6-hydroxy-3-[(1-hydroxy-3-methylbut-2-en-1-ylidene)amino]-5,7a-dimethyl-1-oxo-6,7-dihydro-5h-pyrrolizin-2-yl}methyl)-2,6a-dimethyl-6-oxo-1ah,2h,6bh-oxireno[2,3-a]pyrrolizin-4-yl]-3-methylbut-2-enimidic acid