InChI=1S/C21H26O7/c1-10(2)11(18(25)27-5)9-12-13(17(23)24)21-8-6-7-20(3,4)16(21)15(14(12)22)28-19(21)26/h9-10,15-16H,6-8H2,1-5H3,(H,23,24)/b11-9-