InChI=1S/C18H28O3/c1-17(19)15-13-11-9-7-5-3-2-4-6-8-10-12-14-16-18(20)21/h5,7,9,11,17,19H,4,6,8,10,12-16H2,1H3,(H,20,21)/b7-5-,11-9+