InChI=1S/C19H21NO3/c21-19(20-12-6-3-7-13-20)9-5-2-1-4-8-16-10-11-17-18(14-16)23-15-22-17/h1-2,4-5,8-11,14H,3,6-7,12-13,15H2/b2-1+,8-4+,9-5+