InChI=1/C19H21N3O4/c1-11-8-13(3)17(14(4)9-11)21-16(23)10-20-19(24)15-7-5-6-12(2)18(15)22(25)26/h5-9H,10H2,1-4H3,(H,20,24)(H,21,23)/f/h20-21H 7443E5A6A2E11E8F