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2Ueber das Phenyloxyindol und die Nitrosobenzo??s??ure, Untersuchungen ??ber Triphenylmethanfarbstoffe Hydrazine und Indole Catalytic reductive cyclization of potassium salt of ethyl ester of o-nitrophenylpyruvic acid, Bulletin of the Academy of Sciences of the USSR, Division of chemical science