InChI=1S/C20H32O7/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/h2-4,6-8,12-13,17-18,21-22,25-27H,1,5,9-11,14-16H2,(H,23,24)/b4-3+,6-2-,12-7+,13-8-/t17-,18-/m0/s1