You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Provide the molecular formula for the IUPAC named substance 2-[(2R)-1-[(3,5-diethyl-1-methylpyrazol-4-yl)methyl]pyrrolidin-2-yl]-4,5,6,7-tetrahydro-1H-benzimidazole .
user
C20H31N5
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