InChI=1S/C20H28O4/c1-13-3-7-20-12-24-16(9-15(20)11-21)10-17(20)19(13,2)6-4-14-5-8-23-18(14)22/h5,9,13,16-17,21H,3-4,6-8,10-12H2,1-2H3/t13-,16+,17-,19+,20-/m1/s1