ethyl 2,6-difluoro-3-nitrobenzoate

ethyl 1-amino-6-ethoxy-3-nitrobenzoate

2-butyl-3-chloro-6-ethoxyquinoxaline-5-carboxylic acid

2-butyl-6-ethoxy-5-(hydroxycarbonyl)quinoxalin-3(4H)-one

2-butyl-6-ethoxy-(5-ethoxycarbonyl)quinoxalin-3(4H)-one