A compound of formula (1) and its salts and solvates are provided for the treatment or prophylaxis of hepatitis C virus infections. Methods of making and formulating compound (1) are provided.本發明提供式(1)化合物及其鹽和溶劑化物以治療或預防C型肝炎病毒感染。;;本發明提供製備及調製該化合物(1)之方法。