Abstract:A new amide, the dimer of desmethoxypiplartine(1 ), to gether with four known comp-ounds, (Z) -l2 -octadecenic-α- glycerol mon oester(2), piperine (3), β- sitosterol(4), daucosterol(5),were isloated from Piper longum L. The structures were determined by spectra data and comparision with authentic samples.