Provayblue

http://classyfire.wishartlab.com/tax_nodes/C0000000
http://classyfire.wishartlab.com/tax_nodes/C0000002
http://classyfire.wishartlab.com/tax_nodes/C0000309
http://classyfire.wishartlab.com/tax_nodes/C0000309
http://classyfire.wishartlab.com/tax_nodes/C0003901
http://classyfire.wishartlab.com/tax_nodes/C0002448
http://classyfire.wishartlab.com/tax_nodes/C0004144
http://classyfire.wishartlab.com/tax_nodes/C0004139
http://classyfire.wishartlab.com/tax_nodes/C0004557
http://classyfire.wishartlab.com/tax_nodes/C0003931
http://classyfire.wishartlab.com/tax_nodes/C0004150
https://www.ebi.ac.uk/chebi/searchId.do?chebiId=CHEBI:6872
http://www.genome.jp/dbget-bin/www_bget?cpd:C00220
https://pubchem.ncbi.nlm.nih.gov/summary/summary.cgi?cid=6099
https://pubchem.ncbi.nlm.nih.gov/summary/summary.cgi?sid=310265144
https://www.chemspider.com/Chemical-Structure.5874.html
https://mor.nlm.nih.gov/RxNav/search?searchBy=RXCUI&searchTerm=6878
https://www.ebi.ac.uk/chebi/searchId.do?chebiId=6872
https://www.ebi.ac.uk/chembldb/index.php/compound/inspect/CHEMBL405110
https://en.wikipedia.org/wiki/Methylene_blue