Olyster

https://www.ebi.ac.uk/chebi/searchId.do?chebiId=CHEBI:9445
http://www.hmdb.ca/metabolites/HMDB0015293
http://www.genome.jp/dbget-bin/www_bget?drug:D08569
http://www.genome.jp/dbget-bin/www_bget?cpd:C07127
https://pubchem.ncbi.nlm.nih.gov/summary/summary.cgi?cid=5401
https://pubchem.ncbi.nlm.nih.gov/summary/summary.cgi?sid=46509129
https://www.chemspider.com/Chemical-Structure.5208.html
http://www.bindingdb.org/bind/chemsearch/marvin/MolStructure.jsp?monomerid=50033111
https://mor.nlm.nih.gov/RxNav/search?searchBy=RXCUI&searchTerm=37798
https://www.ebi.ac.uk/chebi/searchId.do?chebiId=9445
https://www.ebi.ac.uk/chembldb/index.php/compound/inspect/CHEMBL611
http://bidd.nus.edu.sg/group/cjttd/ZFTTDDRUG.asp?ID=DAP000371
http://www.pharmgkb.org/drug/PA451612
http://www.rxlist.com/cgi/generic/teraz.htm
https://www.drugs.com/terazosin.html
https://en.wikipedia.org/wiki/Terazosin