[{"from": "human", "value": "Describe this molecule. [C][C][C@H1][Branch1][Branch1][N][C][Ring1][Branch1][C][=Branch1][C][=O][N][C][=C][C][=C][Branch1][Branch1][C][=C][Ring1][=Branch1][C][=N][C][=Branch1][=Branch1][=N][C][=C][Ring1][=Branch1][N][C][=C][C][=C][Branch1][Branch1][C][=C][Ring1][=Branch1][N][C][C][O][C][C][Ring1][=Branch1]"}, {"from": "gpt", "value": "The molecule is a selective inhibitor of the cytoplasmic tyrosine kinase JAK2. An IND for XL019 was filed by Exelixis in May 2007."}]