InChI=1S/C21H30O3/c1-12(22)15-4-5-16-19-17(7-9-21(15,16)3)20(2)8-6-14(23)10-13(20)11-18(19)24/h11,15-19,24H,4-10H2,1-3H3/t15?,16?,17?,18?,19?,20-,21+/m0/s1