dimethyl 5-[ethyl[[4-[[4-hydroxy-3-[[[2-methyl-5-(1-oxododecyl)phenyl]amino]carbonyl]-1-naphthyl]azo]phenyl]sulphonyl]amino]isophthalate

5-[Ethyl[[4-[[4-hydroxy-3-[[[2-methyl-5-(1-oxododecyl)phenyl]amino]carbonyl]naphthalen-1-yl]azo]phenyl]sulfonyl]amino]-1,3-benzenedicarboxylic acid dimethyl ester