Nor

https://www.ebi.ac.uk/chebi/searchId.do?chebiId=CHEBI:100246
http://www.genome.jp/dbget-bin/www_bget?cpd:C06687
http://www.hmdb.ca/metabolites/HMDB0015192
http://www.genome.jp/dbget-bin/www_bget?drug:D00210
http://www.genome.jp/dbget-bin/www_bget?cpd:C06687
https://pubchem.ncbi.nlm.nih.gov/summary/summary.cgi?cid=4539
https://pubchem.ncbi.nlm.nih.gov/summary/summary.cgi?sid=46508634
https://www.chemspider.com/Chemical-Structure.4380.html
http://www.bindingdb.org/bind/chemsearch/marvin/MolStructure.jsp?monomerid=50045000
https://mor.nlm.nih.gov/RxNav/search?searchBy=RXCUI&searchTerm=7517
https://www.ebi.ac.uk/chebi/searchId.do?chebiId=100246
https://www.ebi.ac.uk/chembldb/index.php/compound/inspect/CHEMBL9
https://zinc.docking.org/substances/ZINC000000003742
http://bidd.nus.edu.sg/group/cjttd/ZFTTDDRUG.asp?ID=DAP000654
http://www.pharmgkb.org/drug/PA450654
http://www.rxlist.com/cgi/generic3/norfloxacin.htm
https://www.drugs.com/mtm/norfloxacin-ophthalmic.html
http://www.pdrhealth.com/drug_info/rxdrugprofiles/drugs/nor1302.shtml
https://en.wikipedia.org/wiki/Norfloxacin