You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[1-(6,7-dihydro-4H-thieno[3,2-c]pyridin-5-yl)-1-oxopentan-2-yl]-3-fluorobenzamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C19H21FN2O2S
assistant