2-Amino-4,6,7-trihydroxypteridine 2-Amino-4,6,7-trihydroxypyrimido[4,5-b]pyrazine 4,6,7(1H)-Pteridinetrione, 2-amino-5,8-dihydro- 4,6,7(3H)-Pteridinetrione, 2-amino-5,8-dihydro- 492-11-5 Leikopterin Leucopterin Leukopterin NSC93740