3,4-dehydrothiomorpholine-3-carboxylate + NADPH + 2 H(+) => (3R)-1,4-thiomorpholine-3-carboxylate + NADP(+)
3,4-dehydrothiomorpholine-3-carboxylate + nadph + 2 h(+) => (3r)-1,4-thiomorpholine-3-carboxylate + nadp(+)