Reaction catalyzed by leucoanthocyanidin reductase (1.17.1.3)
+
NADH
+
=
+
NAD+
+
H2O
2,3-trans-3,4-cis-leucocyanidin
+
NADH
+
H+
=
(2R,3S)-catechin
+
NAD+
+
H2O
