N-hydroxy-L-trihomomethionine + reduced [NADPH--hemoprotein reductase] + O2 => N,N-dihydroxy-L-trihomomethionine + oxidized [NADPH--hemoprotein reductase] + H2O + H(+)
n-hydroxy-l-trihomomethionine + reduced [nadph--hemoprotein reductase] + o2 => n,n-dihydroxy-l-trihomomethionine + oxidized [nadph--hemoprotein reductase] + h2o + h(+)