Fig 3. Alkylamides from Echinacea purpurea.

Chromatogram (A) of the crude chloroform layer (CL) from the E. purpurea extract showing the presence of a series of alkylamides (3,4,5,8,9,10,11A,11B,14,15) which were identified according to molecular weight and retention time. The relative amounts of these alkylamides in the silica gel column pooled fractions (1–13) are indicated by the peak areas shown in panel B. The numbering system used for these alkylamides is consistent with that used in a previous report [18]. * indicates compounds detected, but not identified. The structures for seven alkylamides selected to represent the alkylamide content are shown in panel C.