Protan

https://www.ebi.ac.uk/chebi/searchId.do?chebiId=CHEBI:6717
http://www.hmdb.ca/metabolites/HMDB0014922
http://www.genome.jp/dbget-bin/www_bget?drug:D00151
http://www.genome.jp/dbget-bin/www_bget?cpd:C02168
https://pubchem.ncbi.nlm.nih.gov/summary/summary.cgi?cid=4044
https://pubchem.ncbi.nlm.nih.gov/summary/summary.cgi?sid=46505405
https://www.chemspider.com/Chemical-Structure.3904.html
http://www.bindingdb.org/bind/chemsearch/marvin/MolStructure.jsp?monomerid=50134036
https://mor.nlm.nih.gov/RxNav/search?searchBy=RXCUI&searchTerm=6693
https://www.ebi.ac.uk/chebi/searchId.do?chebiId=6717
https://www.ebi.ac.uk/chembldb/index.php/compound/inspect/CHEMBL686
https://zinc.docking.org/substances/ZINC000000020241
http://bidd.nus.edu.sg/group/cjttd/ZFTTDDRUG.asp?ID=DAP000779
http://www.pharmgkb.org/drug/PA450347
http://www.guidetopharmacology.org/GRAC/LigandDisplayForward?ligandId=2593
https://www.ebi.ac.uk/pdbe-srv/pdbechem/chemicalCompound/show/ID8
http://www.rxlist.com/cgi/generic3/mefenamic.htm
https://www.drugs.com/cdi/mefenamic-acid.html
https://en.wikipedia.org/wiki/Mefenamic_acid