p. 3157 - 3165
(2007/10/03)ethyl 7-chloro-4,5-dihydro-8-nitro-4-oxo-1,2,4-triazolo[1,5-a]quinoxaline-2-carboxylate
ethyl 8-amino-7-chloro-4,5-dihydro-4-oxo-1,2,4-triazolo[1,5-a]quinoxaline-2-carboxylate
7-chloro-4,5-dihydro-4-oxo-8-(1,2,4-triazol-4-yl)-1,2,4-triazolo[1,5-a]quinoxaline-2-carboxylic acid ethyl ester
ethyl 7-chloro-4,5-dihydro-4-oxo-1,2,4-triazolo[1,5-a]quinoxaline-2-carboxylate