InChI=1S/C21H17ClO8/c1-7-12-17(9(6-23)14(25)13(7)22)28-16-8(2)11-10(24)5-21(3,4)30-18(11)15(26)19(16)29-20(12)27/h6,25-26H,5H2,1-4H3