InChI=1S/C21H36O4/c1-4-5-6-7-8-9-10-11-12-13-17-24-20(22)14-15-21(23)25-18-16-19(2)3/h12-15,19H,4-11,16-18H2,1-3H3/b13-12+,15-14+