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 (6aR,9R)-N-methyl-N-(3-methylcyclooctyl)-4-propan-2-yl-7-prop-2-enyl-6,6a,8,9,10,10a-hexahydroindolo[4,3-fg]quinoline-9-carboxamide ?
user
C31H45N3O
assistant