You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name (3R)-3-[(2R)-2-(1-methyl-4,5,6,7-tetrahydrobenzimidazol-2-yl)pyrrolidin-1-yl]-1-(2,2,2-trifluoroethyl)pyrrolidin-2-one into its molecular formula.
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C18H25F3N4O
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