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system
Name the molecular formula for the molecule established as 2-[4-[7-[(4-bromophenyl)methyl]-1,3-dimethyl-2,6-dioxopurin-8-yl]piperazin-1-yl]-N-(4-chlorophenyl)acetamide using the IUPAC nomenclature.
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C26H27BrClN7O3
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