2-ethoxyethyl 4-[[(6-diazo-5,6-dihydro-5-oxo-1-naphthyl)sulphonyl]oxy]-gamma-[4-[[(6-diazo-5,6-dihydro-5-oxo-1-naphthyl)sulphonyl]oxy]phenyl]-gamma-methylbenzenebutyrate

4-[[[(6-Diazo-5,6-dihydro-5-oxonaphthalen)-1-yl]sulfonyl]oxy]-γ-[4-[[[(6-diazo-5,6-dihydro-5-oxonaphthalen)-1-yl]sulfonyl]oxy]phenyl]-γ-methylbenzenebutanoic acid 2-ethoxyethyl ester