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 (2-chlorophenyl)-[2-(2-methylpyrimidin-5-yl)-6-morpholin-4-ylpyridin-4-yl]methanone is given. What is its corresponding molecular formula?
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C21H19ClN4O2
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