| Label | Id | |
|---|---|---|
| 4-hydroxybut-2-enoic acid | http://purl.obolibrary.org/obo/CHEBI_137232 | |
| 4-hydroxycrotonic acid | http://purl.obolibrary.org/obo/CHEBI_137232 |
| Label | Id | |
|---|---|---|
| 4-hydroxybut-2-enoic acid | http://purl.obolibrary.org/obo/CHEBI_137232 | |
| 4-hydroxycrotonic acid | http://purl.obolibrary.org/obo/CHEBI_137232 |