You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[6-amino-3,5-dicyano-4-(4-nitrophenyl)pyridin-2-yl]sulfanyl-N-(2,4-dimethylphenyl)acetamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C23H18N6O3S
assistant