You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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For the molecule named N-[5-[2-[(2Z)-2-[[4-(diethylamino)phenyl]methylidene]hydrazinyl]-2-oxoethyl]-1,3,4-thiadiazol-2-yl]-1H-1,2,4-triazole-5-carboxamide by IUPAC nomenclature, provide its molecular formula.
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C18H21N9O2S
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