Ceritinib (Zykadia(R), Novartis), approved in 2014, was developed as a second-generation ALK inhibitor for patients with NSCLC who have developed crizotinib resistance. Ceritinib addresses two of the most common ALK mutants that lead to crizotinib resistance, L1196M andG1269A, but is ineffective for G1202R and F1174C variants of ALK.5-Chloro-N2-(2-isopropoxy-5-methyl-4-(piperidin-4-yl)phenyl)-N4-(2-(isopropylsulfonyl)phenyl)pyrimidine-2,4-diamine, is a Anaplastic lymphoma kinase (ALK) inhibitor.