Reaction catalyzed by pepsin A (3.4.23.1)
+
=
(3R,4S)-3,4-dihydroxy-4-[4-(trifluoromethyl)phenyl]butan-2-one
4-(trifluoromethyl)benzaldehyde
+
1-hydroxypropan-2-one
=
(3R,4S)-3,4-dihydroxy-4-[4-(trifluoromethyl)phenyl]butan-2-one