InChI=1S/C21H28O10/c1-8-4-12-9(10(13-7-28-13)6-14(29-12)21(2,3)27)5-11(8)30-20-17(24)15(22)16(23)18(31-20)19(25)26/h4-5,10,13-18,20,22-24,27H,6-7H2,1-3H3,(H,25,26)