You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 2-methyl-N-[3-[methyl(phenyl)sulfamoyl]phenyl]-3-oxo-4H-1,4-benzothiazine-6-carboxamide by IUPAC nomenclature, provide its molecular formula.
user
C23H21N3O4S2
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