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(a-e) Chromatograms of origanum oil (peak 1: Carvacrol, peak 2: Thymol), basil oil (peak 3: Estragole), tea tree oil (peak 4: Terpinen-4-ol, peak 5: p-cymene), thyme oil (peak 6: Thymol, peak 7: p-cymene, peak 8: Linalool), and chamomile blue oil (peak 9: Bisabolol, peak 10: Trans-b-farnesene)
