InChI=1S/C21H34O3/c1-3-4-5-6-7-8-9-10-11-12-13-14-15-16-17-19-20(22)18(2)24-21(19)23/h1,17-18,20,22H,4-16H2,2H3/b19-17-/t18-,20+/m0/s1