| Label | Id | |
|---|---|---|
| 4-oxopyrrolidinium-2-carboxylate | http://purl.obolibrary.org/obo/CHEBI_77656 | |
| 4-oxoproline zwitterion | http://purl.obolibrary.org/obo/CHEBI_77656 |
| Label | Id | |
|---|---|---|
| 4-oxopyrrolidinium-2-carboxylate | http://purl.obolibrary.org/obo/CHEBI_77656 | |
| 4-oxoproline zwitterion | http://purl.obolibrary.org/obo/CHEBI_77656 |