Abstract
The resin acid components of P. strobus needles were isolated, and the major constituents identified as labdenoic diterpenes. In addition to anticopalic and strobic acids previously reported in the needles, 3-oxoanticopalic, 3β-acetoxyanticopalic, 3β-hydroxyanticopalic acids and the 8α-hydroxy derivative of anticopalic acid were found along with two new compounds. The structures of the two new compounds, a cycloanticopalic acid and an abcoanticopalic acid, were determined by NMR. The composition of the diterpene resin acids was obtained for several samples of P. strobus needles from provenance tests.
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