Fastfen

https://www.ebi.ac.uk/chebi/searchId.do?chebiId=CHEBI:9316
http://www.hmdb.ca/metabolites/HMDB0014846
http://www.genome.jp/dbget-bin/www_bget?drug:D05938
http://www.genome.jp/dbget-bin/www_bget?cpd:C08022
https://pubchem.ncbi.nlm.nih.gov/summary/summary.cgi?cid=41693
https://pubchem.ncbi.nlm.nih.gov/summary/summary.cgi?sid=46504737
https://www.chemspider.com/Chemical-Structure.38043.html
http://www.bindingdb.org/bind/chemsearch/marvin/MolStructure.jsp?monomerid=94503
https://mor.nlm.nih.gov/RxNav/search?searchBy=RXCUI&searchTerm=56795
https://www.ebi.ac.uk/chebi/searchId.do?chebiId=9316
https://www.ebi.ac.uk/chembldb/index.php/compound/inspect/CHEMBL658
https://zinc.docking.org/substances/ZINC000000538386
http://bidd.nus.edu.sg/group/cjttd/ZFTTDDRUG.asp?ID=DAP000357
http://www.pharmgkb.org/drug/PA451527
http://www.guidetopharmacology.org/GRAC/LigandDisplayForward?ligandId=3534
https://www.drugs.com/cdi/sufentanil.html
https://en.wikipedia.org/wiki/Sufentanil