Crizotinib is a 3-[1-(2,6-dichloro-3-fluorophenyl)ethoxy]-5-[1-(piperidin-4-yl)pyrazol-4-yl]pyridin-2-amine that has R configuration at the chiral centre. The active enantiomer, it acts as a kinase inhibitor and is used for the treatment of patients with locally advanced or metastatic non-small cell lung cancer (NSCLC) It has a role as an antineoplastic agent, a biomarker and an EC 2.7.10.1 (receptor protein-tyrosine kinase) inhibitor. It is an enantiomer of an ent-crizotinib.