You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[1-(3,4-dimethylphenyl)sulfonylpiperidin-4-yl]-[(4R)-4-ethyl-6,7-dihydro-4H-thieno[3,2-c]pyridin-5-yl]methanone is the IUPAC name of a molecule. Please give its molecular formula.
user
C23H30N2O3S2
assistant