InChI=1S/C20H38O4/c1-2-3-4-11-14-19(22)15-12-9-7-5-6-8-10-13-16-20(23)24-18-17-21/h9,12,19,21-22H,2-8,10-11,13-18H2,1H3/b12-9-/t19-/m1/s1