InChI=1S/C20H28O4/c1-12-13-5-6-14-19(8-4-7-18(2,3)15(19)10-21)11-24-17(23)20(14,9-13)16(12)22/h13-15,21H,1,4-11H2,2-3H3/t13-,14+,15-,19-,20+/m1/s1