InChI=1S/C21H22O7/c1-10(2)5-6-14-16(8-12(4)18(19(14)24)20(25)26)28-21(27)17-11(3)7-13(22)9-15(17)23/h5,7-9,22-24H,6H2,1-4H3,(H,25,26)