You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-thieno[3,2-c]pyridin-4-yl-N-[[2-(trifluoromethyl)phenyl]methyl]piperidine-4-carboxamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C21H20F3N3OS
assistant