Kayafect black S

C.I. Direct black 159

tetrasodium 4-amino-3-[[4-[2-[4-[(2,4-diaminophenyl)azo]-2-sulphonatophenyl]vinyl]-3-sulphonatophenyl]azo]-5-hydroxy-6-(phenylazo)naphthalene-2,7-disulphonate

4-Amino-3-[[4-[2-[4-[(2,4-diaminophenyl)azo]-2-(sodiooxysulfonyl)phenyl]ethenyl]-3-(sodiooxysulfonyl)phenyl]azo]-5-hydroxy-6-(phenylazo)-2,7-naphthalenedisulfonic acid disodium salt