InChI=1S/C27H28O12/c1-36-20-11-15(3-7-17(20)28)5-9-23(31)38-22-14-27(35,26(33)34)13-19(30)25(22)39-24(32)10-6-16-4-8-18(29)21(12-16)37-2/h3-12,19,22,25,28-30,35H,13-14H2,1-2H3,(H,33,34)/b9-5+,10-6+