Rare A-Type, New Spiro-Type, and Highly Oligomeric Proanthocyanidins from Pinus massoniana
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OA: closed
Abstract
Isolation of underivatized PACs led to three new, structurally unique PACs ( 1 - 3 ) from pine bark. Pinutwindoublin ( 1 ) is the first known trimer with double A-type interflavanyl linkages (2α→O→5,4α→6 and 2α→O→7,4α). Pinuspirotetrin ( 2 ) represents the first PAC tetramer with a heterodimeric framework consisting of one spiro-type and one A-type dimer. Pinumassohexin ( 3 ) was elucidated as a mixed A + B type hexamer that consists of the tetramer, peanut procyanidin E, and an A-type dimer ( 5 ).
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- last seen: 2026-05-19T01:45:01.086888+00:00