papyriferic acid
National Institutes of Health
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Papyriferic acid (PA) is a triterpene that is secreted by glands on twigs of the juvenile ontogenetic phase of resin producing…
Abstract Phenolics and terpenoids characteristic for silver birch (Betula pendula Roth) were screened in current-growth twigs of…
On studying the unsaponifiable part of ethereal extracts of the leaves of the birches Betula ermanii, B. lanata, and B…