InChI=1S/C21H19ClO8/c1-8(7-23)5-11(24)14-10(3)18-20(17(26)19(14)28-4)30-21(27)15-9(2)16(22)12(25)6-13(15)29-18/h5-6,23,25-26H,7H2,1-4H3