InChI=1S/C21H22Cl2O6/c1-21(17(25)10-24)18-16(27-20(29-21)13-4-8-15(23)9-5-13)11-26-19(28-18)12-2-6-14(22)7-3-12/h2-9,16-20,24-25H,10-11H2,1H3