References
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McCormick JR, et al. 6-Demethyltetracyclines and methods for preparing the same. US Patent 2,878,289 dated Mar 17 1959
Miller PA, McCormick JR. Biological conversion of anhydrotetracyclines to tetracyclines. US Patent 3,053,740 dated Sep 11 1962
Goodman JJ. Fermentation of chlortetracycline and demethylchlortetracycline. US Patent 3,050,446 dated Aug 21 1962
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