Butrans 20

https://www.ebi.ac.uk/chebi/searchId.do?chebiId=CHEBI:3216
http://www.hmdb.ca/metabolites/HMDB0015057
http://www.genome.jp/dbget-bin/www_bget?drug:D07132
http://www.genome.jp/dbget-bin/www_bget?cpd:C08007
https://pubchem.ncbi.nlm.nih.gov/summary/summary.cgi?cid=644073
https://pubchem.ncbi.nlm.nih.gov/summary/summary.cgi?sid=46505782
https://www.chemspider.com/Chemical-Structure.559124.html
http://www.bindingdb.org/bind/chemsearch/marvin/MolStructure.jsp?monomerid=50026603
https://mor.nlm.nih.gov/RxNav/search?searchBy=RXCUI&searchTerm=1819
https://www.ebi.ac.uk/chebi/searchId.do?chebiId=3216
https://www.ebi.ac.uk/chembldb/index.php/compound/inspect/CHEMBL560511
https://zinc.docking.org/substances/ZINC000001319780
http://bidd.nus.edu.sg/group/cjttd/ZFTTDDRUG.asp?ID=DAP001353
http://www.pharmgkb.org/drug/PA448685
http://www.rxlist.com/cgi/generic3/suboxone.htm
https://www.drugs.com/cdi/buprenorphine.html
https://en.wikipedia.org/wiki/Buprenorphine