(19E)-geissoschizine + NADPH + H(+) => (16R,19Z)-isositsirikine + NADP(+)
(19e)-geissoschizine + nadph + h(+) => (16r,19z)-isositsirikine + nadp(+)
(19E)-geissoschizine + NADPH + H(+) => (16R,19Z)-isositsirikine + NADP(+)
(19e)-geissoschizine + nadph + h(+) => (16r,19z)-isositsirikine + nadp(+)