InChI=1S/C20H34O7/c21-17(11-6-2-1-5-9-16-20(25,26)27)12-7-3-4-8-13-18(22)14-10-15-19(23)24/h2-4,6,8,13,17-18,21-22,25-27H,1,5,7,9-12,14-16H2,(H,23,24)/b4-3+,6-2-,13-8-/t17-,18-/m0/s1