You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 2-[5-[(2R)-1-(2-methylpropyl)pyrrolidin-2-yl]thiophen-2-yl]-1H-benzimidazole-4-carboxamide by IUPAC nomenclature, provide its molecular formula.
user
C20H24N4OS
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