You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Can you give the molecular formula of the molecule (3E,3aR,8bS)-3-[(4-methyl-5-oxo-2H-furan-2-yl)oxymethylidene]-4,5,6,7,8,8b-hexahydro-3aH-indeno[1,2-b]furan-2-one ?
user
C17H18O5
assistant