You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
8-(3,4-dimethoxyphenyl)-3-(4-methylphenyl)-6-sulfanylidene-2,4-dihydro-1H-pyrido[1,2-a][1,3,5]triazine-7,9-dicarbonitrile The above is the IUPAC name of a molecule. Write its molecular formula.
user
C24H21N5O2S
assistant