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Heacock RA, Mahon ME. 
“Chromatography Of Some Indoles On Formamide-treated Paper”. 
J Chromat. 1974;97:249-262.
The radial chromatography of a wide range of indole compounds on formaldehyde-treated paper has been studied. The Rf values and suitable methods for the detection of approximately 150 indole derivatives are reported. In general, the procedure gives excellent results with most indoles, particularly with relatively non-polar compounds.
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