You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule N-[[4-(4-methoxy-2-methylphenyl)sulfonylphenyl]methyl]imidazo[1,2-a]pyrimidine-6-carboxamide into molecular formula.
user
C22H20N4O4S
assistant