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https://www.ebi.ac.uk/chebi/searchId.do?chebiId=CHEBI:32168
http://www.hmdb.ca/metabolites/HMDB0014535
http://www.genome.jp/dbget-bin/www_bget?drug:D01226
https://pubchem.ncbi.nlm.nih.gov/summary/summary.cgi?cid=5355
https://pubchem.ncbi.nlm.nih.gov/summary/summary.cgi?sid=46504855
https://www.chemspider.com/Chemical-Structure.5162.html
http://www.bindingdb.org/bind/chemsearch/marvin/MolStructure.jsp?monomerid=11638
https://mor.nlm.nih.gov/RxNav/search?searchBy=RXCUI&searchTerm=10239
https://www.ebi.ac.uk/chebi/searchId.do?chebiId=32168
https://www.ebi.ac.uk/chembldb/index.php/compound/inspect/CHEMBL26
http://bidd.nus.edu.sg/group/cjttd/ZFTTDDRUG.asp?ID=DAP000310
http://www.pharmgkb.org/drug/PA164745485
http://www.guidetopharmacology.org/GRAC/LigandDisplayForward?ligandId=958
https://en.wikipedia.org/wiki/Sulpiride