最終更新日：2024/07/31
Betulin is a naturally-abundant triterpene found in the bark of birch trees.
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Betulin is a naturally-abundant triterpene found in the bark of birch trees.
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Betulin is a naturally-abundant triterpene found in the bark of birch trees.
Betulin is a naturally-abundant triterpene found in the bark of birch trees.
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