You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name 5-(2-chlorophenyl)-6-[(4-chlorophenyl)diazenyl]-3-(4-methoxyphenyl)-2-sulfanylidene-5,8-dihydro-1H-pyrimido[4,5-d]pyrimidine-4,7-dione into its molecular formula.
user
C25H18Cl2N6O3S
assistant