InChI=1S/C21H26O4/c1-6-9-16(5)19(13-12-15(3)4)25-21(23)18-11-8-10-17(14-18)20(22)24-7-2/h8,10-11,14,16,19H,3,6-7,9H2,1-2,4-5H3