Presolol

https://www.ebi.ac.uk/chebi/searchId.do?chebiId=CHEBI:6343
http://www.hmdb.ca/metabolites/HMDB0014736
http://www.genome.jp/dbget-bin/www_bget?drug:D08106
http://www.genome.jp/dbget-bin/www_bget?cpd:C07063
https://pubchem.ncbi.nlm.nih.gov/summary/summary.cgi?cid=3869
https://pubchem.ncbi.nlm.nih.gov/summary/summary.cgi?sid=46505511
https://www.chemspider.com/Chemical-Structure.3734.html
http://www.bindingdb.org/bind/chemsearch/marvin/MolStructure.jsp?monomerid=25758
https://mor.nlm.nih.gov/RxNav/search?searchBy=RXCUI&searchTerm=6185
https://www.ebi.ac.uk/chebi/searchId.do?chebiId=6343
https://www.ebi.ac.uk/chembldb/index.php/compound/inspect/CHEMBL429
http://bidd.nus.edu.sg/group/cjttd/ZFTTDDRUG.asp?ID=DAP000038
http://www.pharmgkb.org/drug/PA164743150
http://www.rxlist.com/cgi/generic2/labet.htm
https://www.drugs.com/cdi/labetalol.html
http://www.pdrhealth.com/drug_info/rxdrugprofiles/drugs/nor1301.shtml
https://en.wikipedia.org/wiki/Labetalol