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system
Name the molecular formula for the molecule established as (1R,2R,3R,4S)-4-methyl-3-[(naphthalene-1-carbonylamino)carbamoyl]-7-oxabicyclo[2.2.1]hept-5-ene-2-carboxylic acid using the IUPAC nomenclature.
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C20H18N2O5
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