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2-Aminopurine452-06-2100 % similar 2,4-Diaminopyrimidine156-81-043 % similar 2-Amino-6-chloropurine10310-21-143 % similar 2,6-Diaminopurine1904-98-943 % similar 1,3,5-Triazine-2,4-diamine504-08-539 % similar 1H-Pyrazolo[3,4-d]pyrimidin-4-amine2380-63-433 % similar 2-Aminoimidazole7720-39-033 % similar