| Label | Id | |
|---|---|---|
| (3E)-5-hydroxy-3-(5-hydroxy-2,6-dioxo-1,6-dihydropyridin-3(2H)-ylidene)pyridine-2,6(1H,3H)-dione | http://purl.obolibrary.org/obo/CHEBI_65011 | |
| (5E)-5-(2,5-dihydroxy-6-oxopyridin-3(6H)-ylidene)-3,6-dihydroxypyridin-2(5H)-one | http://purl.obolibrary.org/obo/CHEBI_65011 | |
| Diazodiphenoquinone | http://purl.obolibrary.org/obo/CHEBI_65011 | |
| nicotine blue | http://purl.obolibrary.org/obo/CHEBI_65011 |