Keywords nucleic acid bases,2,4-dithiothymine,2-imidazolone,2-thioimidazolone,protropic tautomerism, solvent effect;

• 核酸碱基衍生物;2;4-二硫基胸腺嘧啶;2-羟基咪唑;2-巯基咪唑;异构化;质子迁移;溶剂化效应;