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Name the molecular formula for the molecule established as (3aS,7aS)-2-[1-(4-nitrophenyl)pyrazole-3-carbonyl]-1,3,3a,4,6,7-hexahydropyrano[3,4-c]pyrrole-7a-carboxylic acid using the IUPAC nomenclature.
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C18H18N4O6
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