a (3R)-2'-hydroxyisoflavanone + NADPH + H(+) => a (3R,4R)-4,2'-dihydroxyisoflavan + NADP(+)
a (3r)-2'-hydroxyisoflavanone + nadph + h(+) => a (3r,4r)-4,2'-dihydroxyisoflavan + nadp(+)
a (3R)-2'-hydroxyisoflavanone + NADPH + H(+) => a (3R,4R)-4,2'-dihydroxyisoflavan + NADP(+)
a (3r)-2'-hydroxyisoflavanone + nadph + h(+) => a (3r,4r)-4,2'-dihydroxyisoflavan + nadp(+)