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http://classyfire.wishartlab.com/tax_nodes/C0000000
http://classyfire.wishartlab.com/tax_nodes/C0002448
http://classyfire.wishartlab.com/tax_nodes/C0000023
http://classyfire.wishartlab.com/tax_nodes/C0000023
http://classyfire.wishartlab.com/tax_nodes/C0000128
http://classyfire.wishartlab.com/tax_nodes/C0001661
http://classyfire.wishartlab.com/tax_nodes/C0001897
http://classyfire.wishartlab.com/tax_nodes/C0002228
http://classyfire.wishartlab.com/tax_nodes/C0004557
http://classyfire.wishartlab.com/tax_nodes/C0004150
https://www.ebi.ac.uk/chebi/searchId.do?chebiId=CHEBI:8499
http://www.hmdb.ca/metabolites/HMDB0001849
http://www.genome.jp/dbget-bin/www_bget?drug:D08443
http://www.genome.jp/dbget-bin/www_bget?cpd:C07407
https://pubchem.ncbi.nlm.nih.gov/summary/summary.cgi?cid=4946
https://pubchem.ncbi.nlm.nih.gov/summary/summary.cgi?sid=46505387
https://www.chemspider.com/Chemical-Structure.4777.html
http://www.bindingdb.org/bind/chemsearch/marvin/MolStructure.jsp?monomerid=25761
https://mor.nlm.nih.gov/RxNav/search?searchBy=RXCUI&searchTerm=8787
https://www.ebi.ac.uk/chebi/searchId.do?chebiId=8499
https://www.ebi.ac.uk/chembldb/index.php/compound/inspect/CHEMBL27
http://bidd.nus.edu.sg/group/cjttd/ZFTTDDRUG.asp?ID=DAP000089
http://www.pharmgkb.org/drug/PA451145
http://www.guidetopharmacology.org/GRAC/LigandDisplayForward?ligandId=564
http://www.rxlist.com/cgi/generic/propran.htm
https://www.drugs.com/propranolol.html
https://en.wikipedia.org/wiki/Propranolol