119-44-8 2-Amino-4,6-dihydroxypteridine 2-Amino-4,6-dihydroxypyrimido(4,5-b)pyrazine 2-Aminopteridine-4(3H),6(5H)-dione 4,6-Pteridinediol, 2-amino- (8CI) 4,6-Pteridinedione, 2-amino-1,5-dihydro- (9CI) EINECS 204-325-0 Ksantopterin NSC 41836 XANTHOPTERIN