InChI=1S/C21H28O12/c1-28-13-7-10(3-5-11(13)22)4-6-15(24)30-9-14-16(25)19(29-2)21(32-14)33-18-12(23)8-31-20(27)17(18)26/h3-7,12,14,16-23,25-27H,8-9H2,1-2H3/b6-4+