... 0 26 novobiocin: X = CH3; Y = NH2 27 chlorobiocin: X = CI; Y = 2-methyl-pyrrol-5-yl Coumarin antibiotics are also potent gyrase inhibitors. Novobiocin, chlorobiocin, and coumerrnycin A1 in- hibit the gyrase B subunit function (ATPase activity) at very low concentrations [21. ...
[Chu, Daniel T. W.; Fernandes, Prabhavathi B.; Claiborne, Akiyo K.; Gracey, Eugene H.; Pernet, Andre G. Journal of Medicinal Chemistry, 1986 , vol. 29, # 11 p. 2364 - 2369]