... of them are in cli- nical use [2]. They differ from nalidixic acid as well as in the annelated heterocyclic structure (quinoline ... H3C-N N- O , v HCN N- O N- .8 HO-CH-CHj-N N- 'Q\-CH-N N- qo Chemistry. ... 7.28(s, IH, С4-Я), 8.03 (d, IH, J = 13 Hz, -NH-Ctf=C), 10.95 (br d, IH, J = 13 Hz ...