You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
3-(furan-2-yl)-1-(4-phenyl-6,7-dihydro-4H-thieno[3,2-c]pyridin-5-yl)prop-2-en-1-one The above is the IUPAC name of a molecule. Write its molecular formula.
user
C20H17NO2S
assistant