Uracil

https://www.ebi.ac.uk/chebi/searchId.do?chebiId=CHEBI:8502
http://metacyc.org/META/new-image?type=COMPOUND&object=CPD-11429
http://www.hmdb.ca/metabolites/HMDB0014690
http://www.genome.jp/dbget-bin/www_bget?drug:D00562
http://www.genome.jp/dbget-bin/www_bget?cpd:C07569
https://pubchem.ncbi.nlm.nih.gov/summary/summary.cgi?cid=657298
https://pubchem.ncbi.nlm.nih.gov/summary/summary.cgi?sid=46505181
https://www.chemspider.com/Chemical-Structure.571424.html
http://www.bindingdb.org/bind/chemsearch/marvin/MolStructure.jsp?monomerid=50133597
https://mor.nlm.nih.gov/RxNav/search?searchBy=RXCUI&searchTerm=8794
https://www.ebi.ac.uk/chebi/searchId.do?chebiId=8502
https://www.ebi.ac.uk/chembldb/index.php/compound/inspect/CHEMBL1518
https://zinc.docking.org/substances/ZINC000004640636
http://bidd.nus.edu.sg/group/cjttd/ZFTTDDRUG.asp?ID=DAP001247
http://www.pharmgkb.org/drug/PA451156
https://www.ebi.ac.uk/pdbe-srv/pdbechem/chemicalCompound/show/3CJ
https://www.drugs.com/cdi/propylthiouracil.html
https://en.wikipedia.org/wiki/Propylthiouracil