Abstract
PODOCARPIC acid occurs as crystalline ‘heart shakes' in the wood of Dacrydium cupressinum, a forest tree endemic to New Zealand. It has been shown to possess the structure I by the work of Sherwood and Short1 and Campbell and Todd2,3. The latter workers established that the 7-isopropyl derivative of podocarpic acid differs from 6-hydroxydehydroabietic acid only in the configuration of the methyl and carboxyl groups at C1. The carboxyl group in podocarpic acid is, in fact, much more highly hindered than that of other resin acids.
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