[{"from": "human", "value": "Given compound, write its InChI. ->  gentisin\n"}, {"from": "gpt", "value": " InChI=1S/C14H14O5/c1-18-8-5-10(16)13-12(6-8)19-11-3-2-7(15)4-9(11)14(13)17/h2-6,9,11-13,15-16H,1H3\n"}]