You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Provide the molecular formula for the IUPAC named substance [(3aS,5R,5aS,6S,8aR,9S,9aR)-6-methoxy-5,8a-dimethyl-1-methylidene-2,8-dioxo-3a,4,5,5a,6,7,9,9a-octahydroazuleno[6,5-b]furan-9-yl] acetate .
user
C18H24O6
assistant