Ricin

https://www.ebi.ac.uk/chebi/searchId.do?chebiId=CHEBI:28077
http://www.genome.jp/dbget-bin/www_bget?cpd:C06688
http://www.hmdb.ca/metabolites/HMDB15179
http://www.genome.jp/dbget-bin/www_bget?drug:D00211
http://www.genome.jp/dbget-bin/www_bget?cpd:C06688
https://pubchem.ncbi.nlm.nih.gov/summary/summary.cgi?cid=5381226
https://pubchem.ncbi.nlm.nih.gov/summary/summary.cgi?sid=46506170
https://www.chemspider.com/Chemical-Structure.10468813.html
http://www.bindingdb.org/bind/chemsearch/marvin/MolStructure.jsp?monomerid=50370232
https://mor.nlm.nih.gov/RxNav/search?searchBy=RXCUI&searchTerm=9384
https://www.ebi.ac.uk/chebi/searchId.do?chebiId=71365
https://www.ebi.ac.uk/chembldb/index.php/compound/inspect/CHEMBL374478
https://zinc.docking.org/substances/ZINC000169621223
http://bidd.nus.edu.sg/group/cjttd/ZFTTDDRUG.asp?ID=DNC000965
http://www.pharmgkb.org/drug/PA451250
http://www.guidetopharmacology.org/GRAC/LigandDisplayForward?ligandId=2765
https://www.ebi.ac.uk/pdbe-srv/pdbechem/chemicalCompound/show/RFP
http://www.rxlist.com/cgi/generic2/rifampin.htm
https://www.drugs.com/cdi/rifampin.html
https://en.wikipedia.org/wiki/Rifampicin