InChI=1S/C20H26O4/c1-11-9-14(21)13-10-12-5-6-15-19(2,3)16(22)7-8-20(15,4)17(12)24-18(13)23-11/h9,12,15,17H,5-8,10H2,1-4H3/t12-,15-,17-,20-/m0/s1