(E)-4-hydroxynon-2-enal + NADP(+) + H2O = (E)-4-hydroxynon-2-enoate + NADPH + 2 H(+)
(e)-4-hydroxynon-2-enal + nadp(+) + h2o = (e)-4-hydroxynon-2-enoate + nadph + 2 h(+)
(E)-4-hydroxynon-2-enal + NADP(+) + H2O = (E)-4-hydroxynon-2-enoate + NADPH + 2 H(+)
(e)-4-hydroxynon-2-enal + nadp(+) + h2o = (e)-4-hydroxynon-2-enoate + nadph + 2 h(+)