InChI=1S/C16H18O11/c17-8-9(18)11(12(20)21)26-13(10(8)19)27-16(14(22)23,15(24)25)6-7-4-2-1-3-5-7/h1-5,8-11,13,17-19H,6H2,(H,20,21)(H,22,23)(H,24,25)