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The essential oils obtained from the leaves of Piper dumosum Rudge and Piper aleyreanum C. DC, collected from the southern Amazon forest, Brazil, were analyzed by GC and GC/MS. The major components found in the oil of P. dumosum were biclyclogermacrene (16.2%), β-caryophyllene (15.9%), β-pinene (16.0%) and α-pinene (12.1%). The oil of P. aleyreanum showed as main constituents β-pinene (14.4%), isocaryophyllene (17.5%) and β-caryophyllene (18.6%).
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