Structural characterization of suberan isolated from river birch (Betula nigra) bark

► A complete structure for suberan has been proposed. ► Structure of suberan assessed from FTIR, py-GC-MS and NMR. ► Suberan is crystalline, whereas suberin is predominantly non-crystalline. ► Suberinic material was subjected to base hydrolysis to isolate suberan.