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