Hemglobin

http://classyfire.wishartlab.com/tax_nodes/C0000000
http://classyfire.wishartlab.com/tax_nodes/C0000264
http://classyfire.wishartlab.com/tax_nodes/C0000265
http://classyfire.wishartlab.com/tax_nodes/C0000346
http://classyfire.wishartlab.com/tax_nodes/C0000346
http://classyfire.wishartlab.com/tax_nodes/C0000339
http://classyfire.wishartlab.com/tax_nodes/C0001166
http://classyfire.wishartlab.com/tax_nodes/C0003997
http://classyfire.wishartlab.com/tax_nodes/C0001205
http://classyfire.wishartlab.com/tax_nodes/C0003940
http://classyfire.wishartlab.com/tax_nodes/C0004150
http://classyfire.wishartlab.com/tax_nodes/C0001831
https://pubchem.ncbi.nlm.nih.gov/summary/summary.cgi?cid=6433164
https://www.chemspider.com/Chemical-Structure.10607713.html
https://www.ebi.ac.uk/chebi/searchId.do?chebiId=31607
https://www.ebi.ac.uk/chembldb/index.php/compound/inspect/CHEMBL1200640
https://en.wikipedia.org/wiki/Iron(II)_fumarate