You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Provide the molecular formula for the IUPAC named substance 4-[2-[(3-chlorophenyl)methyl]-4,7-dimethyl-1,3-dioxo-4a,9a-dihydropurino[7,8-a]imidazol-6-yl]benzenesulfonamide .
user
C22H21ClN6O4S
assistant