Famciclovir by Pro Doc

https://www.ebi.ac.uk/chebi/searchId.do?chebiId=CHEBI:4974
http://www.hmdb.ca/metabolites/HMDB0014570
http://www.genome.jp/dbget-bin/www_bget?drug:D00317
https://pubchem.ncbi.nlm.nih.gov/summary/summary.cgi?cid=3324
https://pubchem.ncbi.nlm.nih.gov/summary/summary.cgi?sid=46507561
https://www.chemspider.com/Chemical-Structure.3207.html
http://www.bindingdb.org/bind/chemsearch/marvin/MolStructure.jsp?monomerid=50248001
https://mor.nlm.nih.gov/RxNav/search?searchBy=RXCUI&searchTerm=68099
https://www.ebi.ac.uk/chebi/searchId.do?chebiId=4974
https://www.ebi.ac.uk/chembldb/index.php/compound/inspect/CHEMBL880
https://zinc.docking.org/substances/ZINC000001530635
http://bidd.nus.edu.sg/group/cjttd/ZFTTDDRUG.asp?ID=DAP000489
http://www.pharmgkb.org/drug/PA449585
http://www.rxlist.com/cgi/generic3/famciclovir.htm
https://www.drugs.com/cdi/famciclovir.html
https://en.wikipedia.org/wiki/Famciclovir