The so-called aggregation pheromone whereby Blaberus craniifer cockroaches attract others of the same species is a 1:1 mixture of the volatile but relatively high-boiling liquid alkanes undecane, CH3(CH2)9CH3, and tetradecane, CH3(CH2)12CH3. Hentriacontane, CH3(CH2)29CH3, is a solid alkane present to the extent of 8–9 percent in
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