InChI=1S/C19H36O4/c1-2-3-4-5-6-7-8-9-10-11-12-13-14-15-19(22)23-17-18(21)16-20/h5-6,18,20-21H,2-4,7-17H2,1H3/b6-5-/t18-/m1/s1