You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(3aR,10bR)-2-methyl-8-propan-2-yl-1,3,3a,4,5,10b-hexahydropyrrolo[3,4-d][2]benzazepin-6-one The above is the IUPAC name of a molecule. Write its molecular formula.
user
C16H22N2O
assistant