Ethotoin

https://www.ebi.ac.uk/chebi/searchId.do?chebiId=CHEBI:4888
http://www.hmdb.ca/metabolites/HMDB0014892
http://www.genome.jp/dbget-bin/www_bget?drug:D00708
http://www.genome.jp/dbget-bin/www_bget?cpd:C07839
https://pubchem.ncbi.nlm.nih.gov/summary/summary.cgi?cid=3292
https://pubchem.ncbi.nlm.nih.gov/summary/summary.cgi?sid=46504521
https://www.chemspider.com/Chemical-Structure.3176.html
http://www.bindingdb.org/bind/chemsearch/marvin/MolStructure.jsp?monomerid=50239975
https://mor.nlm.nih.gov/RxNav/search?searchBy=RXCUI&searchTerm=4136
https://www.ebi.ac.uk/chebi/searchId.do?chebiId=4888
https://www.ebi.ac.uk/chembldb/index.php/compound/inspect/CHEMBL1095
http://bidd.nus.edu.sg/group/cjttd/ZFTTDDRUG.asp?ID=DAP000512
http://www.pharmgkb.org/drug/PA164768735
http://www.rxlist.com/cgi/generic3/peganone.htm
https://www.drugs.com/cdi/ethotoin.html
http://www.pdrhealth.com/drug_info/rxdrugprofiles/drugs/peg1665.shtml
https://en.wikipedia.org/wiki/Ethotoin