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Answer on Organic Chemistry Question for Meenaakshi

Question #8325
How many possible stereoisomers for threonine ? Thereoretically,if we use the formula 2^n,since there is 2 chiral carbon for a threonine,the stereoisomers must be 4.However,according to several resources, there is one pair of diastereomers for threonine. Now I'm confused whether the actual stereoisomers are 3 or 4.
Need help and explanation asap. Thank you
Expert's answer
Threonine exists in four possible stereoisomers with the following
configurations: (2S,3R), (2R,3S), (2S,3S) and (2R,3R).

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