InChI=1S/C21H26O6/c1-24-18-7-4-13(9-20(18)26-3)8-15-12-27-21(16(15)11-22)14-5-6-17(23)19(10-14)25-2/h4-7,9-10,15-16,21-23H,8,11-12H2,1-3H3