Morgan & Finnegan
Benzo[1,8]naphthyridine derivatives, their preparation and the compositions which contain them
 New benzo[b][1,8]naphthyridine derivatives of general formula (I) in which R.sub.1 is a hydrogen atom or an alkyl or hydroxyalkyl radical, R.sub.2 is a hydrogen atom or an alkyl, fluoroalkyl, cycloalkyl (3 to 6 C), alkoxy or alkylamino radical and R.sub.3 is alkyl, R.sub.4 and R.sub.5 are different and are hydrogen or alkyl, or R.sub.3 is H, alkyl or cycloalkyl and R.sub.4 and R.sub.5 are hydrogen, R.sub.6 is hydrogen or fluorine and n is equal to 1 or 2, their salts, their preparation and the compositions which contain them. These new products are used as antimicrobial agents ##STR1## 
Laboratoire Roger Bellon
C A
C07D A61P
inventional inventional
Michel Jean-Francois Guy Michel Philippe
Antoine Desconclois Picaut Barreau Girard