You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule 5-[1-[6-(trifluoromethyl)pyridin-2-yl]piperidin-4-yl]-6,7-dihydro-4H-thieno[3,2-c]pyridine .
user
C18H20F3N3S
assistant