(A) Identification of compounds 1–3, 1–4, and 1–5 and (B) cocrystal structure of compound 1–3 in TRKA (PDB ID 4AOJ, 2.75 Å). The kinase is depicted in yellow ribbons, and the hydrogen bonds are illustrated with blue dashed lines. Compound atoms are colored as follows: carbon, orange; nitrogen, blue; oxygen, red; chlorine, green; fluorine, cyan.