| Label | Id | |
|---|---|---|
| Leu-enkephalin | http://purl.obolibrary.org/obo/CHEBI_80263 | |
| Leumorphin | http://purl.obolibrary.org/obo/CHEBI_80260 | |
| Lienomycin | http://purl.obolibrary.org/obo/CHEBI_80080 | |
| Met-enkephalin-Arg-Gly-Leu | http://purl.obolibrary.org/obo/CHEBI_80264 | |
| Met-enkephalin-Arg-Phe | http://purl.obolibrary.org/obo/CHEBI_80265 | |
| Metastin | http://purl.obolibrary.org/obo/CHEBI_80304 | |
| Mas7 | http://purl.obolibrary.org/obo/CHEBI_80197 | |
| Mas8 | http://purl.obolibrary.org/obo/CHEBI_80198 | |
| Meliantriol | http://purl.obolibrary.org/obo/CHEBI_80723 | |
| Mertensene | http://purl.obolibrary.org/obo/CHEBI_80932 | |
| N-(3-alpha,7-beta-Dihydroxy-5-beta-cholan-24-oyl)-Taurine | http://purl.obolibrary.org/obo/CHEBI_80774 | |
| Michelalbine | http://purl.obolibrary.org/obo/CHEBI_80850 | |
| Mirosamicin | http://purl.obolibrary.org/obo/CHEBI_80018 | |
| Morphine-3-glucuronide | http://purl.obolibrary.org/obo/CHEBI_80631 | |
| Morphine-6-glucuronide | http://purl.obolibrary.org/obo/CHEBI_80581 |