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The prized ancient dyestuff, Tyrian purple, has been extensively and widely studied by multiple spectroscopic and chromatographic methods alike. In this paper, an extraction method adopted by liquid chromatography by using N,N‐dimethylformamide is proposed as a sample pre‐treatment for the characterization of minor reference brominated and unsubstituted isatin and indirubin components by micro‐Raman...
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