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system
Name the molecular formula for the molecule established as (E)-3-(5-chloro-2,3-dihydro-1,4-benzodioxin-7-yl)-N-(2,3-dihydro-1,4-benzodioxin-6-ylmethyl)prop-2-enamide using the IUPAC nomenclature.
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C20H18ClNO5
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