InChI=1S/C19H19ClO8/c1-2-3-4-5-6-7-8-9-10-11-12(17(20)24)27-19-15(23)13(21)14(22)16(28-19)18(25)26/h2-3,10-17,19,21-24H,1H3,(H,25,26)/b3-2-,11-10+