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Under IUPAC nomenclature, a molecule named 1,3-dimethyl-7-[2-[(2R)-2-methylpiperazin-1-yl]-2-oxoethyl]pyrrolo[2,3-d]pyrimidine-2,4-dione;hydrochloride is given. What is its corresponding molecular formula?
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C15H22ClN5O3
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