InChI=1S/C21H40O4/c1-2-3-4-5-6-7-8-9-10-11-12-13-14-15-16-17-21(24)25-19-20(23)18-22/h7-8,20,22-23H,2-6,9-19H2,1H3/b8-7-/t20-/m1/s1