InChI=1/C16H17BrN2O4/c1-2-4-18-15(20)3-5-19-16(21)9-11-8-13-14(10-12(11)17)23-7-6-22-13/h1,8,10H,3-7,9H2,(H,18,20)(H,19,21)/f/h18-19H 2FF1630CB2E4B9D2