Reaction catalyzed by pepsin A (3.4.23.1)
+
=
(3S)-3-[(R)-hydroxy(4-nitrophenyl)methyl]thian-4-one
4-nitrobenzaldehyde
+
thian-4-one
=
(3S)-3-[(R)-hydroxy(4-nitrophenyl)methyl]thian-4-one