ent-kaur-16-ene + reduced [NADPH--hemoprotein reductase] + O2 = ent-kaur-16-en-19-ol + oxidized [NADPH--hemoprotein reductase] + H2O + H(+)
ent-kaur-16-ene + reduced [nadph--hemoprotein reductase] + o2 = ent-kaur-16-en-19-ol + oxidized [nadph--hemoprotein reductase] + h2o + h(+)