Xitin

https://www.ebi.ac.uk/chebi/searchId.do?chebiId=CHEBI:209807
http://www.hmdb.ca/metabolites/HMDB0015426
http://www.genome.jp/dbget-bin/www_bget?drug:D02345
http://www.genome.jp/dbget-bin/www_bget?cpd:C06887
https://pubchem.ncbi.nlm.nih.gov/summary/summary.cgi?cid=441199
https://pubchem.ncbi.nlm.nih.gov/summary/summary.cgi?sid=46505845
https://www.chemspider.com/Chemical-Structure.389981.html
http://www.bindingdb.org/bind/chemsearch/marvin/MolStructure.jsp?monomerid=50335563
https://mor.nlm.nih.gov/RxNav/search?searchBy=RXCUI&searchTerm=2189
https://www.ebi.ac.uk/chebi/searchId.do?chebiId=209807
https://www.ebi.ac.uk/chembldb/index.php/compound/inspect/CHEMBL996
https://zinc.docking.org/substances/ZINC000003830449
http://bidd.nus.edu.sg/group/cjttd/ZFTTDDRUG.asp?ID=DAP000452
http://www.pharmgkb.org/drug/PA448856
https://www.ebi.ac.uk/pdbe-srv/pdbechem/chemicalCompound/show/CFX
http://www.rxlist.com/cgi/generic/cefoxitin.htm
https://www.drugs.com/cdi/cefoxitin.html
https://en.wikipedia.org/wiki/Cefoxitin