InChI=1S/C21H38O4/c1-3-4-5-6-7-8-9-10-11-12-13-14-15-16-17-19(21(24)25)18(2)20(22)23/h19H,2-17H2,1H3,(H,22,23)(H,24,25)/t19-/m1/s1