Abstract
The compass plant, Silphium laciniatum, is an iconic perennial plant of the North American tallgrass prairie. The plants of the tallgrass prairie historically have been subjected to a number of biological and environmental stresses. Among the adaptations developed by S. laciniatum is a large deep taproot. An investigation of the secondary metabolites found in the root of a S. laciniatum specimen has led to the identification of 15 new terpenoids (3-8, 10-17, and 22), which were screened for cytotoxic activity in the NCI-H460 human large-cell lung carcinoma cell line.
Published Version
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