InChI=1S/C20H16ClNO6/c1-11-15(9-19(26)28-10-18(24)25)16-8-14(23)6-7-17(16)22(11)20(27)12-2-4-13(21)5-3-12/h2-8,23H,9-10H2,1H3,(H,24,25)