InChI=1S/C21H19ClO7/c1-8(2)5-6-11-9(3)18-13(7-12(11)23)28-19-14(21(27)29-18)10(4)16(22)17(24)15(19)20(25)26/h5,7,23-24H,6H2,1-4H3,(H,25,26)