InChI=1S/C20H28O4/c1-18-7-3-8-19(2,17(23)24)14(18)6-9-20-10-12(4-5-15(18)20)13(11-20)16(21)22/h11-12,14-15H,3-10H2,1-2H3,(H,21,22)(H,23,24)