1H-purin-6(7H)-one-13C 15N2;3,9-Dihydro-1H-purine-2,6-dione-13C 15N2; 1H,3H,7H-Xanthine-13C 15N2; 1H,3H,9H-Xanthine-13C 15N2; 1H-Purine-2,6-diol-13C 15N2; 2,6-Dioxo-1,2,3,6-tetrahydropurine-13C 15N2; 2,6-Dioxopurine-13C 15N2; 3,9-Dihydro-1H-purine-2,6-dione-13C 15N2; 3,9-Dihydropurine-2,6-dione; 9H-Purine-2,6(1H,3H)-dione; Isoxanthine; NSC 14664; Pseudoxanthine; Purine-2,6(1H,3H)-dione; Xan; Xanthic oxide; Xanthin
