7-Hydroxy-8-nitro-2h-oxazolo[3,2-a]pyridin-5(3h)-one
7-Hydroxy-6-methyl-8-nitro-2h-thiazolo[3,2-a]pyridin-5(3h)-one
1-Benzyl-7-hydroxy-6-methyl-8-nitro-2,3-dihydroimidazo[1,2-a]pyridin-5(1H)-one
Tert-butyl 4-chloro-2-(trifluoromethyl)-5,6-dihydropyrido[3,4-d]pyrimidine-7(8h)-carboxylate