Exact

https://www.ebi.ac.uk/chebi/searchId.do?chebiId=CHEBI:7731
http://www.hmdb.ca/metabolites/HMDB0015296
http://www.genome.jp/dbget-bin/www_bget?drug:D00453
http://www.genome.jp/dbget-bin/www_bget?cpd:C07321
https://pubchem.ncbi.nlm.nih.gov/summary/summary.cgi?cid=4583
https://pubchem.ncbi.nlm.nih.gov/summary/summary.cgi?sid=46507574
https://www.chemspider.com/Chemical-Structure.4422.html
http://www.bindingdb.org/bind/chemsearch/marvin/MolStructure.jsp?monomerid=50045004
https://mor.nlm.nih.gov/RxNav/search?searchBy=RXCUI&searchTerm=7623
https://www.ebi.ac.uk/chebi/searchId.do?chebiId=7731
https://www.ebi.ac.uk/chembldb/index.php/compound/inspect/CHEMBL4
http://bidd.nus.edu.sg/group/cjttd/ZFTTDDRUG.asp?ID=DAP000655
http://www.pharmgkb.org/drug/PA450684
http://www.rxlist.com/cgi/generic/oflox.htm
https://www.drugs.com/cdi/ofloxacin-drops.html
http://www.pdrhealth.com/drug_info/rxdrugprofiles/drugs/flo1181.shtml
https://en.wikipedia.org/wiki/Ofloxacin