20-aldehyde-leukotriene B4 20-monooxygenase activity
Catalysis of the reaction: 20-oxo-leukotriene B4 + O2 + reduced [NADPH-hemoprotein reductase] = 20-carboxy-leukotriene B4 + 2 H+ + H2O + oxidized [NADPH-hemoprotein reductase].
GO:0004497
monooxygenase activity
is_a