You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name 2-(4-chloroanilino)-N-(3-chloro-4-methylphenyl)-4,7-dioxo-1,2,3,4a,5,6,8,8a-octahydropyrido[2,3-d]pyrimidine-5-carboxamide into its molecular formula.
user
C21H21Cl2N5O3
assistant