1-(4-nitrophenyl)-3-(1,3-oxazol-2-yl)urea

3-(4-nitrophenyl)-6,7-diphenyl-[1,3]oxazolo[3,2-a][1,3,5]triazine-2,4-dione

N-[(4-nitrophenyl)carbamoyl]acetamide

3-(4-nitrophenyl)-[1,3]oxazolo[3,2-a][1,3,5]triazine-2,4-dione

6-(4-nitrophenyl)-2-(3,4,5-trimethoxyphenyl)-[1,3,4]thiadiazolo[3,2-a][1,3,5]triazine-5,7-dione