InChI=1S/C21H30O2/c1-6-21(5,18-12-13-19(22)20(23)15-18)14-8-11-17(4)10-7-9-16(2)3/h6,9,11-13,15,22-23H,1,7-8,10,14H2,2-5H3/b17-11+