2,6-Dichloro-7-methyl-7H-purine2273-93-0100 % similar Paraxanthine611-59-648 % similar 7-Methylxanthine552-62-545 % similar 7-Methyladenine935-69-339 % similar 2,4-Dichloro-pyrido[2,3-d]pyrimidine126728-20-937 % similar 2,4,5,6-Tetrachloropyrimidine1780-40-135 % similar 2,4,6,8-Tetrachloropyrimido[5,4-D]pyrimidine32980-71-535 % similar 2,4,7-Trichloropyrido[2,3-D]pyrimidine938443-20-034 % similar 2,4-Dichloro-5-methylpyrimidine1780-31-033 % similar 2,4-Dichloro-5-amino-6-methylpyrimidine13162-27-132 % similar 5-Chloro-1-methyl-1H-imidazole872-49-131 % similar 7-Methylguanine578-76-731 % similar Theobromine83-67-031 % similar 5-Chloro-1-methyl-4-nitroimidazole4897-25-030 % similar Caffeine58-08-230 % similar