InChI=1S/C21H22O7/c1-23-18-7-13(8-19-20(18)28-11-27-19)5-15-14(9-24-21(15)22)4-12-2-3-16-17(6-12)26-10-25-16/h2-3,6-8,14-15,21-22H,4-5,9-11H2,1H3