KM11060 is a mutated F508del cystic fibrosis transmembrane conductance regulator (CFTR) corrector. The most common mutation (~90%) in the CFTR gene is a deletion of phenylalanine 508 (F508del). KM11060 is an analog of sildenafil, which restores a function of the F508del mutated CFTR chloride channel. KM11060 appears to be more potent than sildenafil, forskolin, and genistein.