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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
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http://www.pharmgkb.org/drug/PA451145
http://www.guidetopharmacology.org/GRAC/LigandDisplayForward?ligandId=564
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https://en.wikipedia.org/wiki/Propranolol