InChI=1S/C28H46O4/c1-3-4-5-6-7-8-9-10-11-12-13-14-15-16-17-18-23-32-28(30)22-20-25-19-21-26(29)27(24-25)31-2/h19-22,24,29H,3-18,23H2,1-2H3/b22-20+