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The composition of essential oils from two sources of oleoresins of Protium heptaphyllum were analyzed by GC/MS and Retention Index. The composition of the oils varied according to fresh or aged resin. The oil of fresh resin was rich in α-terpinene (18.0%), p-cymene (36.0%) and γ-terpinene (12.0%), whereas the aged resin oil contained p-cymene (11.0%), terpinolene p-cymen-8-ol (11.0%) and dillapiole (16.0%).
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