A derivative of pyrimido[4,5-d]pyrimidine-2,4,5,7-(1H,3H,6H,8H)-tetraone (PPT), which may form various keto-enol tautomers suitable for forming base pairs with all natural bases, and is thus expected to serve as a universal base, was synthesized. The ability of PPT to form base pairs with natural bases was evaluated by UV analysis.
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