InChI=1S/C20H28O4/c1-11-16-14(24-18(11)23)9-13-12(17(16)22)5-6-15-19(2,10-21)7-4-8-20(13,15)3/h14-15,17,21-22H,4-10H2,1-3H3/t14-,15-,17-,19+,20+/m1/s1