(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 => (e)-4-coumaroyl alcohol + a