ethyl 3,4,5-tris[[(6-diazo-5,6-dihydro-5-oxo-1-naphthyl)sulphonyl]oxy]benzoate

3,4,5-Tris[[[(6-diazo-5,6-dihydro-5-oxonaphthalen)-1-yl]sulfonyl]oxy]benzoic acid ethyl ester