InChI=1S/C20H23NO3/c22-20(13-17-11-12-18(14-20)21(17)23)24-19(15-7-3-1-4-8-15)16-9-5-2-6-10-16/h1-10,17-19,21-22H,11-14H2/t17-,18+,20+