InChI=1S/C33H28O17/c34-15-4-1-12(2-5-15)33(47)50-31-29(45)27(43)22(11-48-32(46)14-8-20(39)26(42)21(40)9-14)49-30(31)24-19(38)10-18(37)23(28(24)44)25(41)13-3-6-16(35)17(36)7-13/h1-10,22,27,29-31,34-40,42-45H,11H2