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 5-(2-amino-1,4-dihydro-[1,3,5]triazino[1,2-a]benzimidazol-4-yl)-1,4-dimethyl-2-phenylpyrazol-3-one is given. What is its corresponding molecular formula?
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C20H19N7O
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