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system
Please write the molecular formula of the molecule 1-[(4-bromo-1-methylpyrrol-2-yl)methyl]-1,2-dimethyl-3-[3-(3-oxo-5,6,7,8-tetrahydro-[1,2,4]triazolo[4,3-a]pyridin-2-yl)propyl]guanidine;hydroiodide .
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C18H29BrIN7O
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