InChI=1S/C18H30O3/c1-2-3-7-11-16-15(13-14-17(16)19)10-8-5-4-6-9-12-18(20)21/h3,7,15-16H,2,4-6,8-14H2,1H3,(H,20,21)/b7-3-/t15-,16+/m0/s1