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