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Hartini, Y. S. .; Utaminingsih; Julianus, J. .; Patramurti, C. .; Nugroho, L. H. . Secondary Metabolite Profile in Mature and Old Leaves of Four Piper Species: Forest Betel (Piper Aduncum L.), Red Betel (Piper Crocatum Ruiz & Pav.), Javanese Chili Betel (Piper Retrofractum Vahl.), and Green Betel (Piper Betle L.). Plant Sci. Today 2024, 11.