6,7,12,13-tetrahydro-5,7-dioxo-5H-indolo[2,3-a]furo[3,4-c]carbazole

{3-[(E)-3-(2-Nitro-phenyl)-allylaminooxalyl]-1H-indol-2-yl}-acetic acid

3-Oxo-3,5-dihydro-pyrano[4,3-b]indole-1-carboxylic acid [(E)-3-(2-nitro-phenyl)-allyl]-amide

ethyl (E)-2-(3-(2-((3-(2-nitrophenyl)allyl)amino)-2-oxoacetyl)-1H-indol-2-yl)acetate

4,7-bis(2-nitrophenyl)isoindol-1-one