Digihep

https://www.ebi.ac.uk/chebi/searchId.do?chebiId=CHEBI:67040
http://www.genome.jp/dbget-bin/www_bget?cpd:C00019
http://www.hmdb.ca/metabolites/HMDB0062709
http://www.genome.jp/dbget-bin/www_bget?cpd:C00019
https://pubchem.ncbi.nlm.nih.gov/summary/summary.cgi?cid=34755
https://pubchem.ncbi.nlm.nih.gov/summary/summary.cgi?sid=46505280
https://www.chemspider.com/Chemical-Structure.31982.html
http://www.bindingdb.org/bind/chemsearch/marvin/MolStructure.jsp?monomerid=28422
https://mor.nlm.nih.gov/RxNav/search?searchBy=RXCUI&searchTerm=9504
https://www.ebi.ac.uk/chebi/searchId.do?chebiId=67040
https://www.ebi.ac.uk/chembldb/index.php/compound/inspect/CHEMBL1088977
http://www.pharmgkb.org/drug/PA164754994
https://www.ebi.ac.uk/pdbe-srv/pdbechem/chemicalCompound/show/SAM
https://www.drugs.com/cdi/s-adenosylmethionine.html
http://www.pdrhealth.com/drug_info/nmdrugprofiles/nutsupdrugs/sad_0231.shtml
https://en.wikipedia.org/wiki/S-Adenosyl_methionine