(6aS,11aS)-3,6a,9-trihydroxypterocarpan + dimethylallyl diphosphate = (6aS,11aS)-4-dimethylallyl-3,6a,9-trihydroxypterocarpan + diphosphate
(6as,11as)-3,6a,9-trihydroxypterocarpan + dimethylallyl diphosphate = (6as,11as)-4-dimethylallyl-3,6a,9-trihydroxypterocarpan + diphosphate