Eupachloroxin

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