Glyceollin synthase is an enzyme responsible for the production of glyceollin. The five substrates of this enzyme are 2-dimethylallyl-(6aS,11aS)-3,6a,9-trihydroxypterocarpan, 4-dimethylallyl-(6aS,11aS)-3,6a,9-trihydroxypterocarpan, NADPH, H+, and O2, whereas its three products are glyceollin, NADP+, and H2O.
In in vitro studies, this molecule has been shown to exhibit antiestrogenic properties.
^Welle, R.; Grisebach, H. (1988). "Induction of phytoalexin synthesis in soybean: Enzymatic cyclization of prenylated pterocarpans to glyceollin isomers". Archives of Biochemistry and Biophysics. 263 (1): 191–198. doi:10.1016/0003-9861(88)90627-3. PMID3369863.