A crystalline compound of formula (1) and its salts and solvates are provided for the treatment or prophylaxis of hepatitis C virus infectionsMethods of making and formulating crystalline compound (1) are provided.提供一種式(1)之結晶性化合物及其鹽及溶劑合物,其係用以治療或預防C型肝炎病毒感染並提供製造及調配結晶性化合物(1)之方法。