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Carlin, R.B.; Henley, W.O.; Carlson. D.P., The Fischer Indole Synthesis V. 2-Carboxy-4,7-dimethylindole from Ethyl Pyruvate 2,6-dimethylphenylhydrazone, J. Am. Chem. Soc., 1957, 79, 5712-7. [all data]