InChI=1S/C21H26O6/c1-14(16(12-24-4)20(23)25-5)7-6-8-15-9-10-17-18(11-15)27-21(2,3)19(22)13-26-17/h6-12,19,22H,13H2,1-5H3/b8-6-,14-7-,16-12-