1. Chemistry of tetracyclines
2. Arcamone , F. 1978. “Topics in Antibiotic Chemistry”, Edited by:
Sammes , P. G. 102, 239New York: Wiley.
3. Webster , E. R. 1951. “Six-membered Heterocyclic Nitrogen Compounds with Four Condensed Rings”, Edited by:
Allen , C. F. H. 3–56. New York: Interscience. b. A. Juric, A. Subljic and N, Trinajslic, J. Heterocyclic Chem.21273(1984). c. N. B. Desai, V. Ramnathan and K. Venkataraman, J. Sci. Industr. Res.15B279(1956)
4. Elderfield , R. C. 1952. “Heterocyclic Compounds, Vol. 4, 3–77. New York: Wiley. b. A. Markovac, G.S. Wu, M. P. LaMontagne, P. Blumbergs and M.S. Ao, J. Heterocyclic Chem.19829(1982)