You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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Under IUPAC nomenclature, a molecule named (5S,6R)-5-(4-methylphenyl)-2-morpholin-4-yl-4,7-dioxo-3,5,6,8-tetrahydropyrido[2,3-d]pyrimidine-6-carbonitrile is given. What is its corresponding molecular formula?
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C19H19N5O3
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