InChI=1S/C17H19NO3/c1-2-3-4-5-9-12-16(19)18-15(13-17(20)21)14-10-7-6-8-11-14/h2-12,15H,13H2,1H3,(H,18,19)(H,20,21)/b3-2+,5-4+,12-9+/t15-/m0/s1