2-Amino-4,6,7-trihydroxypyrimido(4,5-b)pyrazine 2-Aminopteridine-4,6,7-triol 4,6,7(1H)-Pteridinetrione, 2-amino-5,8-dihydro- (8CI)(9CI) 4,6,7(3H)-Pteridinetrione, 2-amino-5,8-dihydro- 492-11-5 EINECS 207-747-3 LEUCOPTERIN Leikopterin Leukopterin NSC 93740