5,5'-Bibarbituric acid, 5,5'-dihydroxy- 76-24-4 ALLOXANTIN, DIHYDRATE Alloxantin NSC7634 Uroxin Uroxine [5,5'-Bipyrimidine]-2,2',4,4',6,6'(1H,1'H,3H,3'H,5H,5'H)-hexone, 5,5'-dihydroxy-