Verpen

https://www.ebi.ac.uk/chebi/searchId.do?chebiId=CHEBI:7982
http://www.hmdb.ca/metabolites/HMDB0014790
http://www.genome.jp/dbget-bin/www_bget?drug:D00498
http://www.genome.jp/dbget-bin/www_bget?cpd:C07421
https://pubchem.ncbi.nlm.nih.gov/summary/summary.cgi?cid=441278
https://pubchem.ncbi.nlm.nih.gov/summary/summary.cgi?sid=46506363
https://www.chemspider.com/Chemical-Structure.390041.html
http://www.bindingdb.org/bind/chemsearch/marvin/MolStructure.jsp?monomerid=50001028
https://mor.nlm.nih.gov/RxNav/search?searchBy=RXCUI&searchTerm=8001
https://www.ebi.ac.uk/chebi/searchId.do?chebiId=7982
https://www.ebi.ac.uk/chembldb/index.php/compound/inspect/CHEMBL560
https://zinc.docking.org/substances/ZINC000000000596
http://bidd.nus.edu.sg/group/cjttd/ZFTTDDRUG.asp?ID=DAP000356
http://www.pharmgkb.org/drug/PA164744326
http://www.guidetopharmacology.org/GRAC/LigandDisplayForward?ligandId=1606
http://www.rxlist.com/cgi/generic/pentazocine.htm
https://www.drugs.com/cdi/pentazocine.html
https://en.wikipedia.org/wiki/Pentazocine