(S)-Tryptophan

https://www.ebi.ac.uk/chebi/searchId.do?chebiId=CHEBI:16828
http://www.genome.jp/dbget-bin/www_bget?cpd:C00078
http://www.hmdb.ca/metabolites/HMDB0000929
http://www.genome.jp/dbget-bin/www_bget?drug:D00020
http://www.genome.jp/dbget-bin/www_bget?cpd:C00078
https://pubchem.ncbi.nlm.nih.gov/summary/summary.cgi?cid=6305
https://pubchem.ncbi.nlm.nih.gov/summary/summary.cgi?sid=46508329
https://www.chemspider.com/Chemical-Structure.6066.html
http://www.bindingdb.org/bind/chemsearch/marvin/MolStructure.jsp?monomerid=21974
https://mor.nlm.nih.gov/RxNav/search?searchBy=RXCUI&searchTerm=10898
https://www.ebi.ac.uk/chebi/searchId.do?chebiId=16828
https://www.ebi.ac.uk/chembldb/index.php/compound/inspect/CHEMBL54976
https://zinc.docking.org/substances/ZINC000000083315
http://bidd.nus.edu.sg/group/cjttd/ZFTTDDRUG.asp?ID=DAP001316
http://www.pharmgkb.org/drug/PA10323
http://www.guidetopharmacology.org/GRAC/LigandDisplayForward?ligandId=717
https://www.ebi.ac.uk/pdbe-srv/pdbechem/chemicalCompound/show/TRP
https://en.wikipedia.org/wiki/Tryptophan