| Label | Id | |
|---|---|---|
| Xanthene | http://purl.obolibrary.org/obo/CHEBI_10057 | |
| Xanthinin | http://purl.obolibrary.org/obo/CHEBI_10061 | |
| Xanthoxylin | http://purl.obolibrary.org/obo/CHEBI_10070 | |
| Xanthumin | http://purl.obolibrary.org/obo/CHEBI_10071 | |
| Xanthyletin | http://purl.obolibrary.org/obo/CHEBI_10073 | |
| Xerantholide | http://purl.obolibrary.org/obo/CHEBI_10076 | |
| Xylometazoline | http://purl.obolibrary.org/obo/CHEBI_10082 | |
| Xylopine | http://purl.obolibrary.org/obo/CHEBI_10083 | |
| Xylopinine | http://purl.obolibrary.org/obo/CHEBI_10084 | |
| Yamogenin | http://purl.obolibrary.org/obo/CHEBI_10086 | |
| Yangambin | http://purl.obolibrary.org/obo/CHEBI_10088 | |
| Yangonin | http://purl.obolibrary.org/obo/CHEBI_10089 | |
| Yohimbin | http://purl.obolibrary.org/obo/CHEBI_10093 | |
| Yohimbine | http://purl.obolibrary.org/obo/CHEBI_10093 | |
| Z-Arg-Arg | http://purl.obolibrary.org/obo/CHEBI_10094 |