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What is the molecular formula of the compound with this IUPAC name 9-[(2R,3R,4S,5R)-3,4-dihydroxy-5-(hydroxymethyl)oxolan-2-yl]-7-methyl-4,5-dihydro-3H-purin-7-ium-2,6-dione ?
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C11H17N4O6+
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