InChI=1S/C29H22Cl2O4/c1-18-3-7-20(8-4-18)28(32)34-26-13-11-24(30)16-22(26)15-23-17-25(31)12-14-27(23)35-29(33)21-9-5-19(2)6-10-21/h3-14,16-17H,15H2,1-2H3