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system
Name the molecular formula for the molecule established as (1S,3R,4R)-3-amino-4-methoxy-N-[2-(6-oxo-3-phenyl-4,5-dihydropyridazin-1-yl)ethyl]cyclohexane-1-carboxamide using the IUPAC nomenclature.
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C20H28N4O3
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