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system
Name the molecular formula for the molecule established as 5-methoxy-8-(4-methoxy-6-oxopyran-2-yl)-7-pyridin-4-yl-1-[(E)-2-pyridin-4-ylethenyl]-2-oxabicyclo[4.2.0]oct-4-en-3-one using the IUPAC nomenclature.
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C26H22N2O6
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