InChI=1S/C21H21ClO7/c1-3-4-5-6-11(23)16-12(24)7-9-14(20(16)27)19(26)15-10(18(9)25)8-13(29-2)17(22)21(15)28/h7-8,11,23-24,27-28H,3-6H2,1-2H3/t11-/m0/s1