(4aS,7aS,8R)-4a-hydroxy-9a-methoxy-3,5,8-trimethyl-4,4a,7a,8,9,9a-hexahydroazuleno[6,5-b]furan-2,7-dione InChI=1/C16H20O5/c1-8-6-16(20-4)11(10(3)14(18)21-16)7-15(19)9(2)5-12(17)13(8)15/h5,8,13,19H,6-7H2,1-4H3/t8-,13-,15-,16?/m1/s azuleno[6,5-b]furan-2,7-dione, 4,4a,7a,8,9,9a-hexahydro-4a-hydroxy-9a-methoxy-3,5,8-trimethyl-, (4aS,7aS,8R)-