Butrum

http://www.genome.jp/dbget-bin/www_bget?drug:D00837
http://www.genome.jp/dbget-bin/www_bget?cpd:C06863
https://pubchem.ncbi.nlm.nih.gov/summary/summary.cgi?cid=6916249
https://pubchem.ncbi.nlm.nih.gov/summary/summary.cgi?sid=46507553
https://www.chemspider.com/Chemical-Structure.16735714.html
http://www.bindingdb.org/bind/chemsearch/marvin/MolStructure.jsp?monomerid=50240437
https://mor.nlm.nih.gov/RxNav/search?searchBy=RXCUI&searchTerm=1841
https://www.ebi.ac.uk/chebi/searchId.do?chebiId=3242
https://www.ebi.ac.uk/chembldb/index.php/compound/inspect/CHEMBL33986
https://zinc.docking.org/substances/ZINC000003812988
http://bidd.nus.edu.sg/group/cjttd/ZFTTDDRUG.asp?ID=DAP000214
http://www.pharmgkb.org/drug/PA164745398
http://www.rxlist.com/cgi/generic2/butor.htm
https://www.drugs.com/cdi/butorphanol-solution.html
https://en.wikipedia.org/wiki/Butorphanol