InChI=1S/C24H28O7/c1-7-13(3)22(26)30-20-18-16(11-9-15-10-12-17(25)29-19(15)18)28-21(20)24(5,6)31-23(27)14(4)8-2/h8-13,20-21H,7H2,1-6H3/b14-8-