InChI=1S/C20H21N3O4/c1-23-12-17(15-6-4-5-7-16(15)19(23)24)22-20(25)21-11-13-10-14(26-2)8-9-18(13)27-3/h4-10,12H,11H2,1-3H3,(H2,21,22,25)