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Name the molecular formula for the molecule established as (4aS,8aS)-1-methyl-7-[5-(pyrrolidin-1-ylmethyl)pyridin-2-yl]-3,4,5,6,8,8a-hexahydro-2H-1,7-naphthyridine-4a-carboxylic acid using the IUPAC nomenclature.
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C20H30N4O2
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