Abstract
A reinvestigation of the aerial parts of Acritopappus confertus afforded, in addition to known compounds, three bisabolene derivatives, 20 ent-labdane derivatives and two diterpene acids with a new carbon skeleton. The acids only could be separated as their methyl esters. The structures were elucidated by spectroscopic methods and a mechanism is proposed for the formation of the new carbon skeleton, which is derived from an ent-labdane derivative. These diterpenes differed from those isolated previously from the same plant, though they are closely related.
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