3a-Hydroxy-5a-androst-16-ene

It was most timely that the only known mammalian semiochemicals which fit nicely into the concept of insect pheromones - two steroids present in the saliva of the domestic boar (5a-androst-16-en-3-one and 3a-hydroxy-5a-androst-16-ene) - were isolated by Patterson (1969), just at the time when interest in olfactory communication was rising. 

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