| abstract |
The invention relates to 2-quinolone derivatives represented by the following formula and salts thereof as well as manufacture methods therefor and pharmaceuticals consisting of one or more of said compounds as main ingredientsn wherein R 1 , R 2 , R 3 , R 4 and R 5 are same or different and are hydrogen, straight or branched lower alkyl with one to eight chain length, halogen, straight or branched lower alkoxy with one to five chain length, nitro, cyano, straight or branched halogeno lower alkyl with one to three chain length or COOR 6 where R 6 is hydrogen or straight or branched lower alkyl with one to three chain length, excluding the case where all of R 1 , R 2 , R 3 , R 4 and R 5 are hydrogen. |