You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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For the molecule named (3,4-dichlorophenyl)methyl-[(3R)-1-(4-ethoxyphenyl)-2,5-dioxopyrrolidin-3-yl]azanium by IUPAC nomenclature, provide its molecular formula.
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C19H19Cl2N2O3+
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