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Under IUPAC nomenclature, a molecule named 2-[[[(6R)-3-ethyl-5,6,7,8-tetrahydro-[1,2,4]triazolo[4,3-a]pyridin-6-yl]methylamino]methyl]indolizine-1-carbonitrile is given. What is its corresponding molecular formula?
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C19H22N6
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