InChI=1S/C20H28O3/c1-13-6-5-7-15(3)18(21)11-9-14(2)12-19-17(10-8-13)16(4)20(22)23-19/h6,12,15,19H,5,7-11H2,1-4H3/b13-6+,14-12+/t15-,19-/m0/s1