The plant material (the papilionaceous birch bark) was collected in June in Poland in the year 2019 (N53° 20′12”, E15° 02′59”) from the natural state, near-located places. Ten samples were harvested and combined into one collective sample.

Samples were deposited in the plant material storage room (No. BC-2019/015) at the Faculty of Chemical Technology and Engineering, Department of Chemical Organic Technology and Polymeric Materials, West Pomeranian University of Technology, Szczecin. The deposited material consisted of samples of dried papilionaceous birch bark (Betula pendula Roth).

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