InChI=1S/C26H42O4/c1-3-4-5-6-7-8-9-10-11-12-13-14-15-16-21-30-26(28)20-18-23-17-19-24(27)25(22-23)29-2/h17-20,22,27H,3-16,21H2,1-2H3/b20-18-