InChI=1S/C16H22O3/c1-10(2)5-6-12-9-13(17)15-16(19-15,14(12)18)8-7-11(3)4/h5-7,13,15,17H,8-9H2,1-4H3/b12-6+/t13-,15-,16+/m0/s1