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M. M. Shemiakin, M. N. Kolosov, M. G. Karapetian, and E. S. Chaman, Proc. Acad. Sci. USSR 112, 669 (1957).
Huang Yao-Tseng, Hsu Yuan-Yao, Acta Chimica Sinica 24, 47 (1958).
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Shemiakin, M.M., Kolosov, M.N., Arbuzov, I.A. et al. Method of synthesizing the “A” ring of tetracyclines. Russ Chem Bull 7, 777 (1958). https://doi.org/10.1007/BF00917301