IUPAC: [(3R,3aS,6aR,9aR,9bS)-6,9-dimethylidene-2-oxo-dodecahydroazuleno[4,5-b]furan-3-yl]methanesulfonic acid

SMILES: OS(=O)(=O)C[C@@H]1[C@@H]2CCC(=C)[C@@H]3CCC(=C)[C@@H]3[C@H]2OC1=O