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Name the molecular formula for the molecule established as 2-methyl-1-(1-pyrimidin-2-ylpiperidin-3-yl)-3-spiro[2-oxabicyclo[3.2.0]heptane-7,1'-cyclopentane]-6-ylguanidine;hydroiodide using the IUPAC nomenclature.
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C21H33IN6O
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