InChI=1S/C31H54O2/c1-2-3-4-5-6-7-8-9-10-11-12-13-14-15-16-17-18-19-20-21-22-23-24-25-29-26-30(32)28-31(33)27-29/h24-28,32-33H,2-23H2,1H3/b25-24+