InChI=1S/C20H26O7/c1-26-18-8-13(3-5-16(18)23)7-15(11-21)20(25,12-22)10-14-4-6-17(24)19(9-14)27-2/h3-6,8-9,15,21-25H,7,10-12H2,1-2H3