You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-(dimethylamino)-1-[(3S)-3-[6-[(3-methylphenyl)methyl]pyridin-2-yl]piperidin-1-yl]ethanone is the IUPAC name of a molecule. Please give its molecular formula.
user
C22H29N3O
assistant