InChI=1S/C21H31O3/c1-13(22)21(24)11-8-18-16-5-4-14-12-15(23)6-9-19(14,2)17(16)7-10-20(18,21)3/h4,15-18,24H,5-12H2,1-3H3/t15?,16-,17+,18+,19+,20+,21+/m1/s1