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system
Provide the molecular formula for the IUPAC named substance [(4R,9S,10R)-1,10-dihydroxy-4-(hydroxymethyl)-6-(iodoamino)-10-methyl-2-methylidene-3a,4,8,9-tetrahydro-3H-pyrrolo[1,2-c]purin-9-yl] 2,3-dichlorobenzoate .
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C18H20Cl2IN5O5
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