| Label | Id | |
|---|---|---|
| oxygen-18 atom | http://purl.obolibrary.org/obo/CHEBI_33815 | |
| schwerer Sauerstoff | http://purl.obolibrary.org/obo/CHEBI_33815 | |
| oxygen-16 atom | http://purl.obolibrary.org/obo/CHEBI_33818 | |
| oxygen-17 atom | http://purl.obolibrary.org/obo/CHEBI_33819 | |
| tritiated water (HTO) | http://purl.obolibrary.org/obo/CHEBI_33811 | |
| oxygen, isotope of mass 18 | http://purl.obolibrary.org/obo/CHEBI_33815 | |
| hydrogen tritium oxide | http://purl.obolibrary.org/obo/CHEBI_33811 |