Isofer

https://www.ebi.ac.uk/chebi/searchId.do?chebiId=CHEBI:9241
http://www.genome.jp/dbget-bin/www_bget?cpd:C07310
http://www.hmdb.ca/metabolites/HMDB0014565
http://www.genome.jp/dbget-bin/www_bget?drug:D00443
http://www.genome.jp/dbget-bin/www_bget?cpd:C07310
https://pubchem.ncbi.nlm.nih.gov/summary/summary.cgi?cid=5833
https://pubchem.ncbi.nlm.nih.gov/summary/summary.cgi?sid=46508525
https://www.chemspider.com/Chemical-Structure.5628.html
http://www.bindingdb.org/bind/chemsearch/marvin/MolStructure.jsp?monomerid=50228080
https://mor.nlm.nih.gov/RxNav/search?searchBy=RXCUI&searchTerm=9997
https://www.ebi.ac.uk/chebi/searchId.do?chebiId=9241
https://www.ebi.ac.uk/chembldb/index.php/compound/inspect/CHEMBL1393
https://zinc.docking.org/substances/ZINC000003861599
http://bidd.nus.edu.sg/group/cjttd/ZFTTDDRUG.asp?ID=DAP000297
http://www.pharmgkb.org/drug/PA451483
http://www.guidetopharmacology.org/GRAC/LigandDisplayForward?ligandId=2875
https://www.ebi.ac.uk/pdbe-srv/pdbechem/chemicalCompound/show/SNL
http://www.rxlist.com/cgi/generic/spiron.htm
https://www.drugs.com/spironolactone.html
http://www.pdrhealth.com/drug_info/rxdrugprofiles/drugs/ald1010.shtml
https://en.wikipedia.org/wiki/Spironolactone