Ellagic acid was found to inhibit E. coli DNA gyrase supercoiling with
approximately the same potency as nalidixic acid. Tricyclic analogs o
f ellagic acid, which vary in the number and position of the hydroxy g
roups as well as their replacement with halogens, have been synthesize
d. The biological activity of these analogs is discussed. (C) 1997 Els
evier Science Ltd. All rights reserved.