direct red 23 (C.I. 29160);Direct Red 23;Scarlet 4BS;Direct Fast Scarlet 4BS;Directred4BS;disodiumsa;disodiumsal;fastred4bs;polycorredse;redemb;redembl;C.I. 29160;Disodium 3-[(4-acetamidophenyl)azo]-4-hydroxy-7-[[[[5-hydroxy-6-(phenylazo)-7-sulphonato-2-naphthyl]amino]carbonyl]amino]naphthalene-2-sulphonate