3-Hydroxykynurenine

3-Hydroxykynurenine is a metabolite of tryptophan, which filters UV light in the human lens.

[1] It is one of two pigments identified as responsible for the goldenrod crab spider's (Misumena vatia) yellow coloration.

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Skeletal formula of 3-hydroxykynurenine
Ball-and-stick model of the 3-hydroxykynurenine molecule as a zwitterion
The Kynurenine pathway , which connects quinolinic acid to tryptophan. The pathway is named for the first intermediate, kynurenine , which is a precursor to kynurenic acid and 3-hydroxykynurenine. [ 2 ]