Atalantolide

4,5-Didehydro-7-deoxo-4-deoxy-7β-hydroxy-6-oxoobacunoic acid methyl

3-[(3S,5aβ,6R,9bR,10aβ)-3-(3-Furanyl)dodecahydro-7-(1-methylethylidene)-9α-hydroxy-3aβ,6,9aα-trimethyl-1,8-dioxonaphth[2,1-c]oxireno[d]pyran-6-yl]propenoic acid methyl ester