| abstract |
As antibacterials and animal growth promoters, the compounds of the formula ##STR1## in which Y is --COOH, --COOR 7 or --CONR 8 , R 9 , n X 1 is H, nitro, alkyl or halogen, n R 10 and R 11 preferably complete a piperazine ring, n Z is oxygen or NR 15 , n n is 0 or 1, and n the others can have various meanings, n and pharmaceutically acceptable hydrate, alkali metal, alkaline earth metal, silver or guanidinium salt or ester thereof. |