You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 3-(3H-benzimidazol-5-yl)-4-(4-bromophenyl)-5-[(2-oxo-2-thiomorpholin-4-ylethyl)amino]-1H-imidazol-2-one by IUPAC nomenclature, provide its molecular formula.
user
C22H21BrN6O2S
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