Allantoic acid is a degradative product of uric acid and associated with purine metabolism[1][2][3].
[1]. Taherkhani A, et, al. Metabolomic Analysis of Membranous Glomerulonephritis: Identification of a Diagnostic Panel and Pathogenic Pathways. Arch Med Res. 2019 May; 50(4):159-169. [2]. Okumura I, et, al. Stereospecificity of conversion of uric acid into allantoic acid by enzymes of Canadida utilis. J Biochem. 1976 May;79(5):1013-9. [3]. Cai HL, et, al. Therapeutic efficacy of atypical antipsychotic drugs by targeting multiple stress-related metabolic pathways. Transl Psychiatry. 2017 May 16; 7(5):e1130.