| Label | Id | |
|---|---|---|
| 1-Pyrroline-4-hydroxy-2-carboxylate | http://purl.obolibrary.org/obo/CHEBI_16352 | |
| 3-hydroxy-3,4-dihydro-2H-pyrrole-5-carboxylic acid | http://purl.obolibrary.org/obo/CHEBI_16352 | |
| 4-hydroxy-1-pyrroline-2-carboxylic acid | http://purl.obolibrary.org/obo/CHEBI_16352 |