OBJECTIVE:To analyze qualitatively the volatile oil in Perilla leaves.METHODS:The chemical constituents in volatile oil of Perilla stem were isolated and identified by GC-MS.The 2D MS data of the overlapped peaks were resolved with heuristic evolving latent projections(HELP)to obtain the chromatographic curve and MS(mass spectra),and a qualitative analysis was performed by similar search in NIST library with the obtained MS and retention time.RESULTS:A total of 76 constituents were identified,of which,19 ha...