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Methyl-3-isopropylpentanoate is identified from the heads of workers and in higher concentration from heads of old queens of Formica polyctena (Förster). In laboratory bioassays this terpenoid ester showed a strong aggression inhibiting effect. While in the abdomina of workers the alarm pheromone undecane is the main compound it is almost completely absent in the abdomina of old queens.

Untersuchungen über Pherom one bei Formica polyctena (Förster) / Studies on the Pheromones of Formica polyctena (Förster)