You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 2-[3-(3-methoxybenzoyl)-7-methyl-4-oxo-1,8-naphthyridin-1-yl]-N-(3-methylsulfanylphenyl)acetamide by IUPAC nomenclature, provide its molecular formula.
user
C26H23N3O4S
assistant