guaethol + reduced [NADH--hemoprotein reductase] + O2 <=> oxidized [NADH--hemoprotein reductase] + catechol + acetaldehyde + H2O + H(+)
guaethol + reduced [nadh--hemoprotein reductase] + o2 <=> oxidized [nadh--hemoprotein reductase] + catechol + acetaldehyde + h2o + h(+)