Shilstine

https://www.ebi.ac.uk/chebi/searchId.do?chebiId=CHEBI:15640
http://www.genome.jp/dbget-bin/www_bget?drug:D07986
http://www.genome.jp/dbget-bin/www_bget?cpd:C03479
https://pubchem.ncbi.nlm.nih.gov/summary/summary.cgi?cid=6006
https://pubchem.ncbi.nlm.nih.gov/summary/summary.cgi?sid=46505436
https://www.chemspider.com/Chemical-Structure.5784.html
http://www.bindingdb.org/bind/chemsearch/marvin/MolStructure.jsp?monomerid=50239970
https://mor.nlm.nih.gov/RxNav/search?searchBy=RXCUI&searchTerm=6313
https://www.ebi.ac.uk/chebi/searchId.do?chebiId=15640
https://www.ebi.ac.uk/chembldb/index.php/compound/inspect/CHEMBL1679
http://bidd.nus.edu.sg/group/cjttd/ZFTTDDRUG.asp?ID=DAP001244
http://www.pharmgkb.org/drug/PA450198
http://www.rxlist.com/cgi/generic/leucovorin.htm
https://www.drugs.com/cdi/leucovorin.html
https://en.wikipedia.org/wiki/Folinic_acid