You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[4-(4-tert-butylphenyl)-2,6-dimethylpiperazin-1-yl]-(5-methylpyridin-3-yl)methanone is the IUPAC name of a molecule. Please give its molecular formula.
user
C23H31N3O
assistant