ABSTRACT

C16H12O6 300.267 Isol. from logwood (Caesalpinia sp.) under alkaline oxidn. conditions. Used as 0.03% soln. in aq. MeOH for photometric detn. of B (lmax 505 nm, e 23000), Hf (lmax 520 nm, e 58000), Ga, Sn. Acidbase indicator (colour change: yellow 0 red 0 purple); biological stain. Inhibitor of Shp2/PTP11 protein tyrosine phosphatase. Shows antiatherogenic activity. Brownish-red needles (EtOH). Mp 2508 dec.