You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
3-(8-methyl-4-oxoquinazolin-3-yl)-N-[2-[(4-methylphenyl)methylsulfanyl]ethyl]propanamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C22H25N3O2S
assistant