You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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Convert the IUPAC name of a molecule (2Z)-5-chloro-2-[(5-chloro-3-ethyl-1,3-benzothiazol-3-ium-2-yl)methylidene]-3-ethyl-1,3-benzothiazole into molecular formula.
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C19H17Cl2N2S2+
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