The invention discloses compounds of Formula I wherein X, R1, R2, and R3 are as defined herein. The present invention relates to compounds and their use in the treatment of cystic fibrosis, methods for their production, pharmaceutical compositions comprising the same, and methods of treating cystic fibrosis by administering a compound of the invention.本發明揭示式I化合物,其中X、R1、R2及R3係如本文中所定義。本發明係關於化合物及其用於治療囊性纖維化之用途、其產生方法、包括其之醫藥組合物及藉由投與本發明化合物來治療囊性纖維化之方法。