InChI=1S/C20H19NO5/c22-18-16-17(19(23)24)26-20(25-16)15(11-13-7-3-1-4-8-13)21(18)12-14-9-5-2-6-10-14/h1-10,15-17,20H,11-12H2,(H,23,24)/t15-,16+,17-,20+/m0/s1