[{"from": "human", "value": "Please give me some details about this molecule. [C][=N][C][=C][Branch1][Ring2][N][Ring1][Branch1][C][=Branch1][C][=S][N][=C][Branch1][Ring2][N][Ring1][Branch2][N]"}, {"from": "gpt", "value": "The molecule is a purine analogue that is used in the therapy of acute and chronic myelogenous leukemias. Thioguanine therapy is associated with minor, usually transient and asymptomatic elevations in serum aminotransferase levels and has also been linked to rare instances of cholestatic acute liver injury and to chronic liver injury, resulting in portal hypertension due to nodular regenerative hyperplasia."}]