InChI=1S/C39H32O15/c40-23-9-1-20(2-10-23)5-15-30(45)50-19-29-33(47)37(53-31(46)16-6-21-3-11-24(41)12-4-21)35(49)39(52-29)54-38-34(48)32-27(44)17-26(43)18-28(32)51-36(38)22-7-13-25(42)14-8-22/h1-18,29,33,35,37,39-44,47,49H,19H2/b15-5+,16-6+