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new compounds of series of tetracyclines in oxygen bridge in 4.6, didemethylamine new 4 - 4 - amino - substituted - demethyltetracyclines and their methods of preparation
new compounds of series of tetracyclines in oxygen bridge in 4.6, didemethylamine new 4 - 4 - amino - substituted - demethyltetracyclines and their methods of preparation