Guanine73-40-5100 % similar Guanine hydrochloride635-39-290 % similar Guanine sulfate10333-92-378 % similar Thioguanine154-42-760 % similar 6-O-Methylguanine20535-83-559 % similar 8-Azaguanine134-58-753 % similar Pterin2236-60-453 % similar 8-Mercaptoguanine28128-40-751 % similar O6-Benzylguanine19916-73-547 % similar 6,7-Dimethylpterin611-55-244 % similar Xanthine69-89-643 % similar 2-Thioxanthine2487-40-341 % similar 2-Amino-5,6-dimethyl-4(3H)-pyrimidinone3977-23-941 % similar Lomeguatrib192441-08-040 % similar Biopterin22150-76-140 % similar 7-Methylguanine578-76-740 % similar 4-Hydroxy-2,5,6-triaminopyrimidine1004-75-739 % similar 2,5-Diamino-4,6-dihydroxypyrimidine40769-69-539 % similar 1,3,5-Triazine-2,4-diamine504-08-538 % similar Penciclovir39809-25-138 % similar