(3aR,4R,6S,6aR,9aR,9bR)-4-hydroxy-9-methyl-3-methylene-3,3a,4,5,6a,7,9a,9b-octahydro-2H-spiro[azuleno[4,5-b]furan-6,2'-oxiran]-2-one InChI=1/C15H18O4/c1-7-3-4-9-11(7)13-12(8(2)14(17)19-13)10(16)5-15(9)6-18-15/h3,9-13,16H,2,4-6H2,1H3/t9-,10-,11+,12-,13-,15-/m1/s spiro[azuleno[4,5-b]furan-6(2H),2'-oxiran]-2-one, 3,3a,4,5,6a,7,9a,9b-octahydro-4-hydroxy-9-methyl-3-methylene-, (3aR,4R,6S,6aR,9aR,9bR)-