(E)-4-coumaroyl alcohol + A = (E)-4-coumaraldehyde + AH2
(e)-4-coumaroyl alcohol + a = (e)-4-coumaraldehyde + ah2
(E)-4-coumaroyl alcohol + A = (E)-4-coumaraldehyde + AH2
(e)-4-coumaroyl alcohol + a = (e)-4-coumaraldehyde + ah2