InChI=1S/C18H24O3/c1-12-10-13(2)16-14(11-12)7-9-18(3,17(16)21)8-5-4-6-15(19)20/h4-9,12-14,16H,10-11H2,1-3H3,(H,19,20)/b6-4+,8-5+