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system
Name the molecular formula for the molecule established as 1-[3-(6,7-dihydro-4H-thieno[3,2-c]pyridin-5-yl)-3-oxopropyl]-3-ethyl-2-[(2-methoxyphenyl)methyl]guanidine;hydroiodide using the IUPAC nomenclature.
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C21H29IN4O2S
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