abstract |
Fluorinated 10-(2,6-dimethyl-4-pyridinyl)-3-methyl-7-oxo-2,3-dihydro-7H-pyrido[1,2,3-de][1,4]benzoxazine-6-carboxylic acids and -benzothiazine-6-carboxylic acids of the formula ##STR1## wherein R is hydrogen, R' is hydrogen or fluoro, R" is alkyl of 1-3 carbon atoms and X is O or S are superior antibacterial agents. |