You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Under IUPAC nomenclature, a molecule named (3aS,6R,6aS,8S,9bS)-6,8-dihydroxy-6,9-dimethyl-3-methylidene-4,5,6a,7,8,9b-hexahydro-3aH-azuleno[4,5-b]furan-2-one is given. What is its corresponding molecular formula?
user
C15H20O4
assistant