The invention provides a novel class of compounds, immunogenic compositions and pharmaceutical compositions comprising such compounds and methods of using such compounds to treat or prevent diseases or disorders associated with Toll-Like Receptors 7. In one aspect, the compounds are useful as adjuvants for enhancing the effectiveness of a vaccine.本發明提供一種新穎類別之化合物,包含該等化合物之免疫原性組合物及醫藥組合物,及使用該等化合物治療或預防與Toll樣受體7有關之疾病或病症的方法。在一態樣中,該等化合物可用作用於增強疫苗有效性之佐劑。