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 p-Nitrobenzeneazothymol. Palkin and Wales. J. Amer. Chem. Soc, 46, 1488 (1924). 

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,, potassium salt. Graham and Macbeth. Trans., 119, 1362 (1921). 

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jTi-Nitrophenol. Marchlewski and Moroz. Bull. Soc. Chim., 35, 473 (1924). 

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