4'-O-methylnorbelladine + reduced [NADPH--hemoprotein reductase] + O2 => (10bR,4aS)-noroxomaritidine + oxidized [NADPH--hemoprotein reductase] + 2 H2O + H(+)
4'-o-methylnorbelladine + reduced [nadph--hemoprotein reductase] + o2 => (10br,4as)-noroxomaritidine + oxidized [nadph--hemoprotein reductase] + 2 h2o + h(+)