You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
4-(4-acetylphenoxy)-1-(4-phenyl-6,7-dihydro-4H-thieno[3,2-c]pyridin-5-yl)butan-1-one is the IUPAC name of a molecule. Please give its molecular formula.
user
C25H25NO3S
assistant