2-[[4-[butyl(2-cyanoethyl) amino]phenyl]azo-5-[(4-nitrophenyl)azo]-3-Thiophenecarbonitrile;2-[4-[N-Butyl-N-(2-cyanoethyl)amino]phenylazo]-5-(4-nitrophenylazo)-3-thiophenecarbonitrile
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