The figure below shows an example of _______. 
Definitions:
(2S,3R)-2,3-Dihydroxybutanoic Acid
A specific stereochemical form of dihydroxybutanoic acid, an organic compound with two hydroxyl groups located at the second and third carbons.
Erythro
A descriptor in stereochemistry denoting molecules with similar substituents on the same side in a Fisher projection.
Threo
Refers to a specific stereochemical configuration in certain molecules where two substituents are on opposite sides of a molecule, often used in the context of sugar chemistry.
D-Glucopyranose
A cyclic form of glucose with a six-membered ring, it is a common form of glucose found in nature.
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