<prompt> Xanthurenic acid is the metabolite in the metabolism ofUric acidXanthineTryptophanUronic acid  <response>: 3-Hydroxy Kynurenine is one of the intermediate in tryptophan catabolism, which gets conveed to next intermediate and this conversion requires vitamin B6 PLP. So, in B6 deficiency, this reaction does not occur and 3-Hydroxy Kynurenine is diveed to form alternate metabolite, Xanthurenic acid See fig, which is excreted in urine 