Sapropterin dihydrochloride69056-38-8100 % similar Tetrahydrobiopterin17528-72-293 % similar Sapropterin62989-33-793 % similar Dihydrobiopterin6779-87-944 % similar Biopterin22150-76-138 % similar Tetrahydrofolic acid135-16-036 % similar 2,5-Diamino-4,6-dihydroxypyrimidine hydrochloride56830-58-133 % similar Guanine hydrochloride635-39-231 % similar 2-Amino-5-bromo-6-methyl-4-pyrimidinol6307-35-331 % similar 2-Amino-5,6-dimethyl-4(3H)-pyrimidinone3977-23-930 % similar