Ansamycin

https://www.ebi.ac.uk/chebi/searchId.do?chebiId=CHEBI:45367
http://www.hmdb.ca/metabolites/HMDB14753
http://www.genome.jp/dbget-bin/www_bget?drug:D00424
http://www.genome.jp/dbget-bin/www_bget?cpd:C07235
https://pubchem.ncbi.nlm.nih.gov/summary/summary.cgi?cid=6323490
https://pubchem.ncbi.nlm.nih.gov/summary/summary.cgi?sid=46506468
https://www.chemspider.com/Chemical-Structure.10482168.html
http://www.bindingdb.org/bind/chemsearch/marvin/MolStructure.jsp?monomerid=50237607
https://mor.nlm.nih.gov/RxNav/search?searchBy=RXCUI&searchTerm=55672
https://www.ebi.ac.uk/chebi/searchId.do?chebiId=45367
https://www.ebi.ac.uk/chembldb/index.php/compound/inspect/CHEMBL444633
https://zinc.docking.org/substances/ZINC000169621215
http://bidd.nus.edu.sg/group/cjttd/ZFTTDDRUG.asp?ID=DAP000656
http://www.pharmgkb.org/drug/PA451249
https://www.ebi.ac.uk/pdbe-srv/pdbechem/chemicalCompound/show/RBT
http://www.rxlist.com/cgi/generic2/rifabutin.htm
https://www.drugs.com/cdi/rifabutin.html
https://en.wikipedia.org/wiki/Rifabutin