Exalgo

https://www.ebi.ac.uk/chebi/searchId.do?chebiId=CHEBI:5790
http://www.hmdb.ca/metabolites/HMDB0014472
http://www.genome.jp/dbget-bin/www_bget?cpd:C07042
https://pubchem.ncbi.nlm.nih.gov/summary/summary.cgi?cid=5284570
https://pubchem.ncbi.nlm.nih.gov/summary/summary.cgi?sid=46508700
https://www.chemspider.com/Chemical-Structure.4447624.html
http://www.bindingdb.org/bind/chemsearch/marvin/MolStructure.jsp?monomerid=50241341
https://mor.nlm.nih.gov/RxNav/search?searchBy=RXCUI&searchTerm=3423
https://www.ebi.ac.uk/chebi/searchId.do?chebiId=5790
https://www.ebi.ac.uk/chembldb/index.php/compound/inspect/CHEMBL398707
https://zinc.docking.org/substances/ZINC000000402954
http://bidd.nus.edu.sg/group/cjttd/ZFTTDDRUG.asp?ID=DAP000472
http://www.pharmgkb.org/drug/PA449918
http://www.rxlist.com/cgi/generic/hydromorphone.htm
https://www.drugs.com/cdi/hydromorphone.html
http://www.pdrhealth.com/drug_info/rxdrugprofiles/drugs/dil1137.shtml
https://en.wikipedia.org/wiki/Hydromorphone