2835-45-2 5,5'-Bibarbituric acid, 5,5'-dihydroxy-1,1',3,3'-tetramethyl- NSC120351 [5,5'-Bipyrimidine]-2,2',4,4',6,6'(1H,1'H,3H,3'H,5H,5'H)-hexone, 5,5'-dihydroxy-1,1',3,3'-tetramethyl-