InChI=1S/C17H23NO3/c18-11-13-3-8-15(9-4-13)17(21)14-6-1-12(2-7-14)5-10-16(19)20/h1-2,6-7,13,15H,3-5,8-11,18H2,(H,19,20)/t13-,15-