Reaction catalyzed by pepsin A (3.4.23.1)

		+			=		(2S)-2-[(R)-hydroxy(3-nitrophenyl)methyl]cyclohexan-1-one
	3-nitrobenzaldehyde	+		cyclohexanone	=		(2S)-2-[(R)-hydroxy(3-nitrophenyl)methyl]cyclohexan-1-one