InChI=1S/C20H28O4/c1-5-7-15-12-17(21)16(19(22)18(15)20(23)24)11-10-14(4)9-6-8-13(2)3/h8,10,12,21-22H,5-7,9,11H2,1-4H3,(H,23,24)/b14-10+