Lignans of western red cedar (Thuja plicata Donn). VII. Dihydroxythujaplicatin

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Abstract
The structure of a 7th lignan from the hot-water extractive of western red cedar, which was partially separated in a previous paper, has been determined as 2,3-dihydroxy-2-(3[image],4[image]-dihydroxy-5[image]-methoxybenzyl)-3-(4[image]-hydroxy-3[image]-methoxybenzyl)-butyrolactone. This lignan is the 5th member of the thujaplicatin series and is trivially named dihydroxythujaplicatin. Methylation, ethylation, and degradation studies provide proof of structure by comparison with known compounds.