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The contents and composition of essential oils obtained from Heracleum  sosnowskyi and Heracleum mantegazzianum (Apiaceae) were examined. essential  oils were investigated by the GC/MS method. The composition of hogweeds’  essential oils was examined in order to determine toxic compounds that could  have a direct influence on the health of people and animals living in close  proximity to both species. It was found that the essential oils, except for  derivatives of coumarins, contain numerous toxic compounds, e.g. isobutyl  isobutyrate, isoamyl butyrate, hexyl hexanoate, 1-hexadecanol etc. No  significant differences were found in the chemical composition of the  examined seed samples of Heracleum, which confirms the suggestions that the  species can be closely related

Identification of bioactive components of essential oils in Heracleum sosnowskyi and Heracleum mantegazzianum (Apiaceae)