59429-75-3Relevant academic research and scientific papers
Tetracyclic compounds
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, (2008/06/13)
Tetracyclic compounds of the formula STR1 wherein R1, R2, R3 and R4 each are H or alkyl, R5 is H, F, Cl, Br, CF3, OH, alkyl, alkoxy, NO2, NH2, alkylamino, dialkylamino or acylamino and X is O, S, SO, SO2, NH, N-alkyl or N-acyl, alkyl and alkoxy in each case being of 1-3 carbon atoms and acyl in each case being of 1-4 carbon atoms, with the proviso that when R5 is methoxy and X is a sulfur atom, R5 is in the 8- or 9-position only, and their physiologically acceptable acid addition salts, possess broad spectrum antibacterial activity, including tetracycline-resistant Gram-positive and Gram-negative organisms.
