InChI=1S/C21H38O5/c1-2-3-10-13-19-20(26-19)14-11-8-6-4-5-7-9-12-15-21(24)25-17-18(23)16-22/h8,11,18-20,22-23H,2-7,9-10,12-17H2,1H3/b11-8-/t18-,19?,20?/m0/s1