InChI=1S/C22H28O4/c1-14(6-8-16-12-17(23)9-11-19(16)24)7-10-18-15(2)21(25)20(26-5)13-22(18,3)4/h6,9,11-13,23-24H,7-8,10H2,1-5H3/b14-6-