| Label | Id | |
|---|---|---|
| 3-hydroxy-4-({2-sulfonato-4-[(4-sulfonatophenyl)diazenyl]phenyl}diazenyl)naphthalene-2,7-disulfonate | http://purl.obolibrary.org/obo/CHEBI_90323 | |
| Ponceau S(4-) | http://purl.obolibrary.org/obo/CHEBI_90323 | |
| Ponceau S tetraanion | http://purl.obolibrary.org/obo/CHEBI_90323 |