4,8-dihydroxycasbene + reduced [NADPH--hemoprotein reductase] + O2 = 4,5,8-trihydroxycasbene + oxidized [NADPH--hemoprotein reductase] + H2O + H(+)
4,8-dihydroxycasbene + reduced [nadph--hemoprotein reductase] + o2 = 4,5,8-trihydroxycasbene + oxidized [nadph--hemoprotein reductase] + h2o + h(+)