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-(2-chloro-4-methoxyphenyl)-3-ethyl-7-methyl-5-propan-2-ylpyrrolo[2,1-f][1,2,4]triazin-4-one is given. What is its corresponding molecular formula?
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C19H22ClN3O2
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