You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named N-(4,6-dimethylpyrimidin-2-yl)-4-[2-(4-methoxyphenyl)benzimidazol-1-yl]benzenesulfonamide by IUPAC nomenclature, provide its molecular formula.
user
C26H23N5O3S
assistant