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Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
Example of a species (VI) of the same molecular weight of species V in which the peptide chain oligomer is linked to two flavonoid monomer units of tannin oligomers, showing the possibilities of cross-linking of the adhesive system.