Eupachlorin

(Z)-2-Methyl-2-butenoic acid (3aR)-6-chloromethyl-2,3,3a,4,5,6,6aβ,7,9a,9bα-decahydro-6β,7α,9aβ-trihydroxy-9-methyl-3-methylene-2-oxoazuleno[4,5-b]furan-4α-yl ester