Nolatrexed147149-76-6100 % similar Nolatrexed dihydrochloride152946-68-493 % similar 2-Amino-5,6-dimethyl-4(3H)-pyrimidinone3977-23-935 % similar Pterin2236-60-433 % similar 2-Amino-5-bromo-6-methyl-4-pyrimidinol6307-35-333 % similar 6,7-Dimethylpterin611-55-232 % similar 4-Hydroxy-2,5,6-triaminopyrimidine1004-75-731 % similar 8-Azaguanine134-58-730 % similar