Hypergen

https://www.ebi.ac.uk/chebi/searchId.do?chebiId=CHEBI:61058
http://www.hmdb.ca/metabolites/HMDB0011754
http://www.genome.jp/dbget-bin/www_bget?drug:D08205
http://www.genome.jp/dbget-bin/www_bget?cpd:C07194
https://pubchem.ncbi.nlm.nih.gov/summary/summary.cgi?cid=38853
https://pubchem.ncbi.nlm.nih.gov/summary/summary.cgi?sid=46508535
https://www.chemspider.com/Chemical-Structure.35562.html
http://www.bindingdb.org/bind/chemsearch/marvin/MolStructure.jsp?monomerid=48449
https://mor.nlm.nih.gov/RxNav/search?searchBy=RXCUI&searchTerm=1545996
https://www.ebi.ac.uk/chebi/searchId.do?chebiId=61058
https://www.ebi.ac.uk/chembldb/index.php/compound/inspect/CHEMBL459
https://zinc.docking.org/substances/ZINC000000020255
http://bidd.nus.edu.sg/group/cjttd/ZFTTDDRUG.asp?ID=DAP000226
http://www.pharmgkb.org/drug/PA450453
http://www.rxlist.com/cgi/generic2/methyl.htm
https://www.drugs.com/cdi/methyldopa.html
http://www.pdrhealth.com/drug_info/rxdrugprofiles/drugs/ald1012.shtml
https://en.wikipedia.org/wiki/Methyldopa