You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[(6,7-dimethyl-2-oxochromen-4-yl)methylsulfanyl]-N-[(1S)-1-(3,4-dimethylphenyl)ethyl]acetamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C24H27NO3S
assistant