(3aR)-3aα,4,4a,5,6,7,7aα,8,9,9aβ-Decahydro-4α,7β-diacetoxy-5β-hydroxy-4aβ,8α-dimethyl-3-methyleneazuleno[6,5-b]furan-2(3H)-one [ 33627-28-0 ]