L-Mannose is a white crystalline sugar (C6H12O6) and the mirror image of D-mannose. It plays a role in biochemical research on carbohydrate stereochemistry and glycosylation, though it is less common in nature.

L-Sorbose is a white crystalline ketose sugar (C6H12O6) with a sweetness similar to sucrose, used in biochemical studies and as a precursor in vitamin C production. It dissolves well in water and exhibits a specific optical rotation around -43°.