10alpha-hydroxy-3-oxoguaia-4(15),11(13)-dieno-12,6-lactone 6-Hydroxy-6-methyl-3,9-dimethylene-octahydro-azuleno[4,5-b]furan-2,8-dione Chinensiolide A InChI=1/C15H18O4/c1-7-9-4-5-15(3,18)10-6-11(16)8(2)12(10)13(9)19-14(7)17/h9-10,12-13,18H,1-2,4-6H2,3H3/t9-,10+,12-,13-,15+/m0/s azuleno[4,5-b]furan-2,8(3H,4H)-dione, octahydro-6-hydroxy-6-methyl-3,9-bis(methylene)-, (3aS,6R,6aR,9aR,9bS)- rel-(3aR,6S,6aS,9aS,9bR)-6-hydroxy-6-methyl-3,9-bis(methylene)octahydroazuleno[4,5-b]furan-2,8(3H,4H)-dione