Eupatundin

(Z)-2-Methyl-2-butenoic acid (3aR,6aβ,7aα,8cα)-dodecahydro-7α,8bβ-dihydroxy-8aα-methyl-3,6-bis(methylene)-2-oxooxireno[2,3]azuleno[4,5-b]furan-4α-yl ester