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For Communication I, see [3].
Translated from Khimiko-Farmarsevticheskii Zhurnal, Vol. 9, No. 7, pp. 13–17, July, 1975.
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Belen'kaya, R.S., Lapachev, V.V. & Lipkin, A.E. Synthesis of nitrogen derivatives of 2-substituted cinchoninic acids. Pharm Chem J 9, 433–436 (1975). https://doi.org/10.1007/BF00759347
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DOI: https://doi.org/10.1007/BF00759347