Genistin Description Glucoside of Genistein exhibiting cytotoxic effects in vitro. Genistin is an inhibitor of protein tyrosine kinase and DNA toposomerase. Specifications Cas No. 529-59-9 Product ID G1653 Product Name Genistin Formula Wt. 432.38 Store Temp Ambient References Shaoquan et. al. J of Nutri. 129: 1291-1297 (1999).