... Among various structural modifications of the quino- lone antibacterials, substitution with a nitrogen contain- ing heterocyclic group of medium size (eg ... Chemistry. ... these compounds leme 2 HJS/CHN JOJ COOCjH, снэ 0 /сООСгЦ, | СНг-CI w * -N COOCjHj /соос,н, J Ph2O/250°C ...