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Name the molecular formula for the molecule established as 5-[(3,4-dimethylphenyl)methyl]-8-hydroxy-3,11-dimethyl-1,4,5,11-tetrazatricyclo[7.4.0.02,7]trideca-2(7),3,8-triene-6,10-dione using the IUPAC nomenclature.
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C20H22N4O3
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