InChI=1S/C21H30O7/c1-7-10(2)17(22)27-16(15-11(3)18(23)28-19(15)24)21(5)12(4)14-9-8-13(21)20(25-6)26-14/h7,12-14,16,18,20,23H,8-9H2,1-6H3/b10-7-