6-thioxo-7,9-dihydro-1H-purine-2,8(3H,6H)-dione-13C-15N2; 7,9-Dihydro-6-thioxo-1H-purine-2,8(3H,6H)-dione Sodium Salt Dihydrate-13C15N2 6-Thio-uric Acid Sodium Dihydrate-13C15N2 2,8-Dihydroxy-6-mercaptopurine Sodium Dihydrate-13C15N2 6-Thiouric Acid Sodium Dihydrate-13C15N2 NSC 46380-13C15N2