Azathioprine446-86-6100 % similar 5-Chloro-1-methyl-4-nitroimidazole4897-25-042 % similar 6-Methylmercaptopurine50-66-842 % similar 6-Methoxy-9H-purine1074-89-131 % similar 5-Methyl-4-nitroimidazole14003-66-831 % similar 6-Dmap938-55-631 % similar 6-Mercaptopurine50-44-231 % similar Hypoxanthine68-94-031 % similar