The competitive N1-, N2-, O- and C-methylation of 3-trifluoromethyl-1H-pyrazol-5-ol for synthesis of analgesic compounds by Burgart, Ya.V., Agafonova, N.A., Shchegolkov, E.V., Borisevich, S.S., Khursan, S.L., Maslova, V.V., Triandafilova, G.A., Solodnikov, S.Yu, Krasnykh, O.P., Saloutin, V.I.

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