You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name N-[3-[[2-chloro-6-(2,6-dichloro-3,5-dimethoxyphenyl)-7-oxo-5,8-dihydropyrimido[4,5-d]pyrimidin-5-yl]methyl]phenyl]methanesulfonamide into its molecular formula.
user
C22H20Cl3N5O5S
assistant