You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-methyl-N-(1,2,3,6-tetrahydropyridin-4-ylmethyl)-2-[3-(trifluoromethyl)phenyl]propanamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C17H21F3N2O
assistant