টপিয়াম

https://pubchem.ncbi.nlm.nih.gov/summary/summary.cgi?cid=5487427
https://pubchem.ncbi.nlm.nih.gov/summary/summary.cgi?sid=46504448
https://www.chemspider.com/Chemical-Structure.19618474.html
http://www.bindingdb.org/bind/chemsearch/marvin/MolStructure.jsp?monomerid=50239981
https://mor.nlm.nih.gov/RxNav/search?searchBy=RXCUI&searchTerm=69120
https://www.ebi.ac.uk/chebi/searchId.do?chebiId=90960
https://www.ebi.ac.uk/chembldb/index.php/compound/inspect/CHEMBL1900528
https://zinc.docking.org/substances/ZINC000100008319
http://bidd.nus.edu.sg/group/cjttd/ZFTTDDRUG.asp?ID=DAP000344
http://www.pharmgkb.org/drug/PA164769056
https://www.ebi.ac.uk/pdbe-srv/pdbechem/chemicalCompound/show/0HK
http://www.rxlist.com/cgi/generic/spiriva.htm
https://www.drugs.com/cdi/tiotropium.html
https://en.wikipedia.org/wiki/Tiotropium