Threonine can exist in four possible stereoisomers with the following configurations: (2S,3R), (2R,3S), (2S,3S) and (2R,3R).
A treonina pode presentarse en forma de catro posibles estereoisómeros coas seguintes configuracións: (2S,3R), (2R,3S), (2S,3S) e (2R,3R).