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