Spedra 200

https://www.ebi.ac.uk/chebi/searchId.do?chebiId=CHEBI:66876
http://www.genome.jp/dbget-bin/www_bget?drug:D03217
https://pubchem.ncbi.nlm.nih.gov/summary/summary.cgi?cid=9869929
https://pubchem.ncbi.nlm.nih.gov/summary/summary.cgi?sid=175427065
https://www.chemspider.com/Chemical-Structure.8045620.html
http://www.bindingdb.org/bind/chemsearch/marvin/MolStructure.jsp?monomerid=235766
https://mor.nlm.nih.gov/RxNav/search?searchBy=RXCUI&searchTerm=1291301
https://www.ebi.ac.uk/chebi/searchId.do?chebiId=66876
https://www.ebi.ac.uk/chembldb/index.php/compound/inspect/CHEMBL1963681
https://zinc.docking.org/substances/ZINC000011677857
https://www.ebi.ac.uk/pdbe-srv/pdbechem/chemicalCompound/show/E6L
http://www.rxlist.com/stendra-drug.htm
https://www.drugs.com/mtm/avanafil.html
https://en.wikipedia.org/wiki/Avanafil