InChI=1S/C16H21NO/c18-12-5-4-11-9-15-13-3-1-2-6-16(13,7-8-17-15)14(11)10-12/h4-5,10,13,15,17-18H,1-3,6-9H2/t13-,15+,16+/m1/s1