(3aR,7R,8R,9S,9bS)-6,9-dimethyl-3-methylene-2-oxo-2,3,3a,4,5,7,8,9,9a,9b-decahydro-7,9-epoxyazuleno[4,5-b]furan-8-yl rel-2-methylbutanoate 5alphaH-2beta,4-Epoxy-3beta-(2-methylbutyryloxy)guaia-1(10),-11(13)-dien-6beta,12-olide (3beta-O-(2-methylbutyryl)moroccolide A InChI=1/C20H26O5/c1-6-9(2)18(21)24-17-16-13-10(3)7-8-12-11(4)19(22)23-15(12)14(13)20(17,5)25-16/h9,12,14-17H,4,6-8H2,1-3,5H3/t9?,12-,14?,15+,16-,17-,20+/m0/s butanoic acid, 2-methyl-, (3aS,7S,8S,9R,9bR)-2,3,3a,4,5,7,8,9,9a,9b-decahydro-6,9-dimethyl-3-methylene-2-oxo-7,9-epoxyazuleno[4,5-b]furan-8-yl ester