| abstract |
PROBLEM TO BE SOLVED: To provide a compound for treating cystic fibrosis, a pharmaceutically acceptable salt thereof, and a pharmaceutical composition containing the same. SOLUTION: A compound of formula (I) or a pharmaceutically acceptable salt thereof, and a pharmaceutical composition containing the same are used. [In the formula, X 1 and X 2 may be substituted with independently selected H, halo, and 1 or more independently selected halos may be substituted with C 1-4 alkyl, etc., and R 1 is C 1-4 . R2 , such as alkyl, represents a 5- to 6-membered monocyclic heteroaryl containing 1, 2 or 3 heteroatoms independently selected from the group consisting of O, S, and N. ] [Selection diagram] None |