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Name the molecular formula for the molecule established as 2-[(2,6-dichlorophenyl)methyl]-4-methyl-6-(4-phenoxyphenyl)-4a,7,8,9a-tetrahydropurino[7,8-a]imidazole-1,3-dione using the IUPAC nomenclature.
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C27H23Cl2N5O3
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