The present invention relates to compounds of the formulawherein A1, A2, A3 and R1 to R8 are defined in the description, and to pharmaceutically acceptable salts thereof, their manufacture, pharmaceutical compositions containing them and their use as medicaments for the treatment and/or prophylaxis of diseases which can be treated with HDL-cholesterol raising agents, such as particularly dyslipidemia, atherosclerosis and cardiovascular diseases.本發明係關於下式之化合物其中A1、A2、A3及R1至R8在本說明書中定義,及其醫藥上可接受之鹽、其製造、含有其之醫藥組合物,及其作為藥劑之用途,用於治療及/或預防可用HDL-膽固醇提升劑治療之疾病,尤其例如血脂異常、動脈粥樣硬化及心血管疾病。