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(a) Structures of radicicol, AUY922 and EC144. The resorcinol group of radicicol and AUY922 are indicated by black squares. The group which contacts D93 in crystal structures is highlighted in yellow. (b) Absorbance spectra of 100 μM radicicol. (c) The absorbance of radicicol (at 320 nm), AUY922 (at 302 nm) and EC144 (at 340 nm) versus pH. Solid lines are fit to the titration of a single group. Error bars are the SEM of three measurements
