1,3,7-trimethyluric acid 1,3,7-trimethyluric acid 1,3,7-trimethyluric acid, also referred to as trimethyluric acid and 8-oxy-caffeine, is a purine alkaloid that is produced in some plants and occurs as a minor metabolite of caffeine in humans. the enzymes that metabolize caffeine into 1,3,7-trimethyluric acid in humans include cyp1a2, cyp2e1, cyp2c8, cyp2c9, and cyp3a4. 1,3,7-trimethyluric acid names preferred iupac name 1,3,7-trimethyl-7,9-dihydro-1h-purine-2,6,8(3h)-trione other names 8-oxy-caffeine identifiers cas number 5415-44-1 y 3d model (jsmol) interactive image chebi chebi:691622 chembl chemblchembl1767 chemspider 71754 y echa infocard 100.024.098 kegg c16361 pubchem cid 79437 unii z61un6mhb7 y comptox dashboard (epa) dtxsid50202496 inchi inchi=1s/c8h10n4o3/c1-10-4-5(9-7(10)14)11(2)8(15)12(3)6(4)13/h1-3h3,(h,9,14)key: byxcfumgebzddi-uhfffaoysa-n smiles cn1c2=c(nc1=o)n(c(=o)n(c2=o)c)c properties chemical formula c8h10n4o3 molar mass 210.192 appearance white, crystalline melting point ≥ 300 °c (572 °f; 573 k) except where otherwise noted, data are given for materials in their standard state (at 25 °c , 100 kpa). infobox references