You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[[(3R)-3,5-dicyano-4,4-dimethyl-2-oxo-1,3-dihydropyridin-6-yl]sulfanyl]-N-[(1S)-1-(4-methylphenyl)propyl]acetamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C21H24N4O2S
assistant