(19E)-geissoschizine + reduced [NADPH--hemoprotein reductase] + O2 = 3,17-didehydrostemmadenine + oxidized [NADPH--hemoprotein reductase] + 2 H2O
(19e)-geissoschizine + reduced [nadph--hemoprotein reductase] + o2 = 3,17-didehydrostemmadenine + oxidized [nadph--hemoprotein reductase] + 2 h2o