InChI=1S/C21H20O7/c1-9(2)5-6-12-11(4)18-15(8-13(12)22)27-19-16(21(26)28-18)10(3)7-14(23)17(19)20(24)25/h5,7-8,22-23H,6H2,1-4H3,(H,24,25)