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(a) Images of filter paper and all CTMP samples without betulin and without hot-pressing (starting sample), with betulin without hot-pressing (BET-NoHP), with betulin without hot-pressing (NoBET-HP), and with betulin and with hot-pressing (BET-HP). (b) 1H-NMR spectra of betulin and (c) 1H-NMR spectra of betulin taken from the BET-HP sample (hot-pressing at 280°C).
