Robuta

https://pubs.rsc.org/en/content/articlelanding/2015/tc/c4tc01997k A water-soluble eumelanin polymer with typical polyelectrolyte behaviour by triethyleneglycol... N-functionalization of 5,6-dihydroxyindole with a hydrophilic triethyleneglycol (TEG) chain provides access to a new class of water-soluble eumelanin-like... water solublepolymer