Citrulline

https://www.ebi.ac.uk/chebi/searchId.do?chebiId=CHEBI:16349
http://www.genome.jp/dbget-bin/www_bget?cpd:C00327
http://www.hmdb.ca/metabolites/HMDB0000904
http://www.genome.jp/dbget-bin/www_bget?drug:D07706
http://www.genome.jp/dbget-bin/www_bget?cpd:C00327
https://pubchem.ncbi.nlm.nih.gov/summary/summary.cgi?cid=9750
https://pubchem.ncbi.nlm.nih.gov/summary/summary.cgi?sid=46506583
https://www.chemspider.com/Chemical-Structure.9367.html
http://www.bindingdb.org/bind/chemsearch/marvin/MolStructure.jsp?monomerid=92903
https://mor.nlm.nih.gov/RxNav/search?searchBy=RXCUI&searchTerm=2567
https://www.ebi.ac.uk/chebi/searchId.do?chebiId=16349
https://www.ebi.ac.uk/chembldb/index.php/compound/inspect/CHEMBL444814
https://zinc.docking.org/substances/ZINC000001532614
http://www.pharmgkb.org/drug/PA164747225
http://www.guidetopharmacology.org/GRAC/LigandDisplayForward?ligandId=722
https://www.ebi.ac.uk/pdbe-srv/pdbechem/chemicalCompound/show/CIR
https://en.wikipedia.org/wiki/Citrulline