≥98% [HPLC]
Chromogenic substrate used to reveal enzymatic activity of beta-Gal (LacZ) reporter gene: J.R. Sanes et al., EMBO, 5, 3133 (1986). Substrate for the detection of coliforms: M. Manafi and W. Kneifel, Zentralbl. Hyg., 189, 225 (1989).