| Abstract
| - Two new norditerpenoid acids of the labdane-type (norgrindelic acids), 4,5-dehydro-6-oxo-18-norgrindelicacid (1) and 4β-hydroxy-6-oxo-19-norgrindelic acid (2), as well as a new grindelic acid derivative, 18-hydroxy-6-oxogrindelic acid (3), were isolated from the aerial parts of Grindelia nana. In addition, theknown compounds, 6-oxogrindelic acid, grindelic acid, methyl grindeloate, 7α,8α-epoxygrindelic acid, and4α-carboxygrindelic acid were also isolated. The structures of the new compounds were characterized onthe basis of spectroscopic analysis.
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