| Member | Definition | Role |
|---|
| 1-amino-2-naphthol-4-sulfonic acid | | 4-amino-3-hydroxynaphthalene-1-sulfonic acid |
| 1-anilino-8-naphthalenesulfonate | A naphthalenesulfonic acid that is naphthalene-1-sulfonic acid substituted by a phenylamino group at position 8. | 8-anilinonaphthalene-1-sulfonic acid |
| 1-naphthalenesulfonic acid | | naphthalene-1-sulfonic acid |
| 1-naphthylamine-5-sulfonic acid | | 5-Amino-1-naphthalenesulfonic acid |
| 2-naphthalenesulfonic acid | A naphthalenesulfonic acid in which the sulfo group is linked to position 2 of the naphthalene ring. | naphthalene-2-sulfonic acid |
| chromotropic acid | A naphthalenesulfonic acid that is naphthalene-2,7-disulfonic acid substituted by hydroxy groups at positions 4 and 5. | chromotropic acid |
| naphthol yellow | A naphthalenesulfonic acid that is naphthalene-2-sulfonic acid substituted by nitro groups at positions 5 and 7 as well as a hydroxy group at position 8. The disodium salt is the biological stain 'naphthol yellow S'. | flavianic acid |
| ponceau mx | A naphthalenesulfonic acid that is naphthalene-2,7-disulfonic acid carrying additional hydroxy and (2,4-dimethylphenyl)diazenyl substituents at positions 3 and 4 respectively. The disodium salt is the biological stain 'acid red 26'. | 4-[(2,4-dimethylphenyl)diazenyl]-3-hydroxynaphthalene-2,7-disulfonic acid |
| reactive red 120 dye | A bis(azo) compound that consists of a benzene core having two (4-amino-6-chloro-1,3,5-triazin-2-yl)amino groups attached at positions 1 and 4 and which in turn have 5-hydroxy-6-[(2-sulfophenyl)diazenyl]-2,7-disulfonaphthalen-4-yl groups attached to their 4-amino functions. | Reactive red 120 |
| suramin | A member of the class of phenylureas that is urea in which each of the amino groups has been substituted by a 3-({2-methyl-5-[(4,6,8-trisulfo-1-naphthyl)carbamoyl]phenyl}carbamoyl)phenyl group. An activator of both the rabbit skeletal muscle RyR1 and sheep cardiac RyR2 isoform ryanodine receptor channels, it has been used for the treatment of human African trypanosomiasis for over 100 years. | suramin |