InChI=1S/C20H20ClNO7/c1-19(28)7-5-8-16(22-2)11(24)6-12(25)20(8,29)18(27)13(7)17(26)14-10(23)4-3-9(21)15(14)19/h3-4,7-8,16,22-23,27-29H,5-6H2,1-2H3/t7?,8?,16?,19-,20+/m0/s1