InChI=1S/C22H22O7/c1-27-19-10-14(6-9-18(19)25)4-7-16(23)13-17(24)8-5-15-11-20(28-2)22(26)21(12-15)29-3/h4-12,25-26H,13H2,1-3H3/b7-4+,8-5+