InChI=1S/C17H23NO3/c1-11(19)21-15-10-13-8-9-14(18(13)2)16(15)17(20)12-6-4-3-5-7-12/h3-7,13-17,20H,8-10H2,1-2H3/t13-,14+,15+,16-,17+/m0/s1