You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule 1-(4-amino-1,2,5-oxadiazol-3-yl)-5-(4-nitrophenyl)-N-[(4-propan-2-ylphenyl)methylideneamino]triazole-4-carboxamide into molecular formula.
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C21H19N9O4
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