InChI=1S/C21H24O6/c1-5-6-14-9-18(23-3)21(19(10-14)24-4)27-13(2)20(22)15-7-8-16-17(11-15)26-12-25-16/h5,7-11,13,20,22H,1,6,12H2,2-4H3