Abstract
Methyl ethers of hydroxy and keto derivatives of abietic and dehydroabietic acids — 12α-hydroxy- and 12-ketoabietic and 12-hydroxy-, 15-hydroxy-, and 17-ketodehydroabietic acids — have been isolated from an extract of needle-free shoots of the Scotch pine and have been identified in the form of methyl esters.
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