Suberin is found in specialized plant cell walls located in, for example, the outer bark. It forms a lamellar structure where aromatic and aliphatic domains alternate. The aliphatic cross-linked domain is mainly composed of C18-C22 𝜔𝜔-hydroxy fatty acids, 𝛼𝛼, 𝜔𝜔-diacids, and their homolog with mid-chain modification as hydroxyl groups, unsaturations, and epoxy groups, with the presence of glycerol acting as a cross-linking agent. The content of specific monomers, as well as the overall weight percentage of suberin to bark are strongly dependent on the tree species, ranging from 20 to 50 wt. % of the dry bark. Birch bark is particularly rich in suberin where the 18-hydroxy-9,10-epoxy octadecanoic acid (EFA) represents one of the main components. This 𝜔𝜔-hydroxy fatty acid has previously been isolated and used in (bio)catalytic synthesizes of polyesters and as a hydrophobic coating on cellulose sheets , paperboard , and aspen wood. Furthermore, Johansson and coworkers have reported the synthesis of oligomers from EFA monomers with a targeted degree of pomerization and how to employ cationic photopolymerization to produce thermosets. Finally, they explored the self-polycondensation kinetics and proposed the synthesis and use of an EFA-based thermoset as an adhesive. In most such applications, the extraction of the EFA is then followed by extensive purification, as through recrystallization or column chromatography , which involves further use of solvents and energy consumption.