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Name the molecular formula for the molecule established as 3-[(3-bromophenyl)methyl]-N-(3-methoxypropyl)-N-methyl-6,8-dihydro-5H-[1,2,4]triazolo[4,3-a]pyrazine-7-carboxamide using the IUPAC nomenclature.
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C18H24BrN5O2
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