Biopterin22150-76-1100 % similar Pterin2236-60-453 % similar 6,7-Dimethylpterin611-55-246 % similar Tetrahydrobiopterin17528-72-240 % similar Sapropterin62989-33-740 % similar Guanine73-40-540 % similar 7-Methylguanine578-76-739 % similar Xanthopterin monohydrate5979-01-138 % similar Sapropterin dihydrochloride69056-38-838 % similar Pteroic acid119-24-438 % similar Guanine hydrochloride635-39-237 % similar Dihydrobiopterin6779-87-936 % similar 8-Azaguanine134-58-735 % similar 2-Amino-5,6-dimethyl-4(3H)-pyrimidinone3977-23-934 % similar 8-Mercaptoguanine28128-40-734 % similar Guanine sulfate10333-92-334 % similar Penciclovir39809-25-133 % similar 2′-C-Methylguanosine374750-30-833 % similar Entecavir142217-69-433 % similar Ganciclovir82410-32-033 % similar