6-Thioxanthine2002-59-7100 % similar 3,9-Dihydro-1H-purine-2,6-dithione5437-25-263 % similar Xanthine69-89-663 % similar 6-Mercaptopurine50-44-252 % similar 2-Thioxanthine2487-40-350 % similar 6-Mercaptopurine monohydrate6112-76-147 % similar Thioguanine154-42-741 % similar Hypoxanthine68-94-039 % similar 1-Methylxanthine6136-37-437 % similar N2-Acetylguanine19962-37-936 % similar 7-Deazaxanthine39929-79-834 % similar Guanine73-40-531 % similar 3H-1,2,3-Triazolo[4,5-D]pyrimidine-5,7(4H,6H)-dione1468-26-431 % similar Uric acid69-93-231 % similar 4-Thiouracil591-28-631 % similar 6-Hydrazinyl-9H-purine5404-86-430 % similar