(2R,3R)-2,3,4-Trihydroxybutanoic acid
(2R,3R)-2,3,4-Trihydroxybutanoic acid, also known as erythronic acid, is a naturally occurring organic acid found in the aqueous humor of the eye, as well as in urine, plasma, cerebrospinal fluid, and synovial fluid, prevalent in both healthy adults and children; it is produced through the oxidation of GlcNAc.