Synonyms:
c.i. pigment red 166 ; pigment red 166 (c.i. 20730) ; cromophtal scarlet r ; c.i. 20730 ; 1,4-bis[1-[(2,5-dichlorophenyl)azo]-2-hydroxynaphthalen-3-ylcarbonylamino]benzene ; 2-naphthalenecarboxamide, n,n-1,4-phenylenebis4-(2,5-dichlorophenyl)azo-3-hydroxy- ; n,n'-1,4-phenylenebis[4-(2,5-dichlorophenyl)azo]-3-hydroxy-2-naphthalenecarboxamide ; 1,4-bis[[1-(2,5-dichlorophenylazo)-2-hydroxy-3-naphthoyl]amino]benzene ; cromophtal scarlet r (cgy) ; pigment red 166