InChI=1S/C20H21N3O4/c21-20(27)23-17-7-3-1-5-13(17)11-16(15-6-2-4-8-18(15)23)22-14(12-24)9-10-19(25)26/h1-8,12,14,16,22H,9-11H2,(H2,21,27)(H,25,26)/t14-,16+/m0/s1