Inhibition of VHR dual-specificity protein tyrosine phosphatase activity by flavonoids isolated from Scutellaria baicalensis: structure-activity relationships - Lee,M.S.; Oh,W.K.; Kim,B.Y.; Ahn,S.C.; Kang,D.O.; Sohn,C.B.; Osada,H.; Ahn,J.S. (Planta Med, 2002)