You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name 2-methoxy-1-[1'-[(2R)-1-methylpiperidine-2-carbonyl]spiro[6,7-dihydro-1H-imidazo[4,5-c]pyridine-4,4'-piperidine]-5-yl]ethanone into its molecular formula.
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C20H31N5O3
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