| abstract |
WHEREIN R is hydrogen, pyridyl, alkyl of 1 to 4 carbon atoms, phenyl, pchloro-phenyl, p-(alkyl of 1 to 4 carbon atoms)-phenyl, pnitro-phenyl or 3,5-dinitro-4-hydroxy-phenyl, and R'' is hydrogen, pyridyl or alkyl of 1 to 4 carbon atoms, OR A 2(1H)-pyridone tautomer thereof; and methods of using the same. OR Antimicrobial pharmaceutical compositions containing as an active ingredient a compound of the formula |