Geranic acid
Encyclopedia
Geranic acid, or 3,7-dimethyl-2,6-octadienoic acid, is a pheromone
Pheromone
A pheromone is a secreted or excreted chemical factor that triggers a social response in members of the same species. Pheromones are chemicals capable of acting outside the body of the secreting individual to impact the behavior of the receiving individual...

used by some organisms.
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