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Not sure on the IUPAC naming of this cyanine dye (Cy5) I don't think it's a ylidene since it only has 1 nitrogen per heterocyclic section. Please help. Thanks!
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Answer #1

The IUPAC name of cyanine dye ia (2Z)-3ethyl-2-{(1-ethylquinolin-1-ium-4-yl)methylidene}-1,3,benzothiazole iodide

here 2 nitrogen are joined by polymethine chains that is why it is a ylidene

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