Tetrahydrobiopterin17528-72-2100 % similar Sapropterin62989-33-7100 % similar Sapropterin dihydrochloride69056-38-893 % similar Dihydrobiopterin6779-87-946 % similar Biopterin22150-76-140 % similar Tetrahydrofolic acid135-16-038 % similar 2-Amino-5-bromo-6-methyl-4-pyrimidinol6307-35-333 % similar 2-Amino-5,6-dimethyl-4(3H)-pyrimidinone3977-23-932 % similar 8-Bromoguanosine4016-63-130 % similar Pterin2236-60-430 % similar 3′-O-Methylguanosine10300-27-330 % similar