InChI=1S/C21H30O3/c1-5-6-7-8-14-10-18(23)20-15-9-13(2)17(22)12-16(15)21(3,4)24-19(20)11-14/h9-11,15-17,22-23H,5-8,12H2,1-4H3/t15-,16?,17-/m1/s1