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system
Please write the molecular formula of the molecule ethyl (2Z,5S)-5-(2-bromo-4,5-dimethoxyphenyl)-2-[(3-bromo-4-hydroxy-5-nitrophenyl)methylidene]-7-methyl-3-oxo-5H-[1,3]thiazolo[3,2-a]pyrimidine-6-carboxylate .
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C25H21Br2N3O8S
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