Pencor

https://www.ebi.ac.uk/chebi/searchId.do?chebiId=CHEBI:4708
http://www.hmdb.ca/metabolites/HMDB0014728
http://www.genome.jp/dbget-bin/www_bget?drug:D07874
http://www.genome.jp/dbget-bin/www_bget?cpd:C06970
https://pubchem.ncbi.nlm.nih.gov/summary/summary.cgi?cid=3157
https://pubchem.ncbi.nlm.nih.gov/summary/summary.cgi?sid=46506825
https://www.chemspider.com/Chemical-Structure.3045.html
http://www.bindingdb.org/bind/chemsearch/marvin/MolStructure.jsp?monomerid=86731
https://mor.nlm.nih.gov/RxNav/search?searchBy=RXCUI&searchTerm=49276
https://www.ebi.ac.uk/chebi/searchId.do?chebiId=4708
https://www.ebi.ac.uk/chembldb/index.php/compound/inspect/CHEMBL707
http://bidd.nus.edu.sg/group/cjttd/ZFTTDDRUG.asp?ID=DAP000381
http://www.pharmgkb.org/drug/PA449407
http://www.rxlist.com/cgi/generic/doxazo.htm
https://www.drugs.com/doxazosin.html
http://www.pdrhealth.com/drug_info/rxdrugprofiles/drugs/car1069.shtml
https://en.wikipedia.org/wiki/Doxazosin