CAS 33956-49-9 is the primary sex pheromone component of Cydia pomonella — codling moth — one of the most economically significant pests in apple and pear production worldwide. It's commonly referred to as codlemone, and it's been the subject of commercial pheromone programs since the 1970s.
The compound is a C12 diol with two double bonds at the 8 and 10 positions, both in the E configuration. That stereochemistry is critical. Biological activity drops significantly if the EE isomer purity falls below a certain threshold, and some of the incorrect isomers can even act as behavioral antagonists — meaning low-purity material doesn't just work less well, it can actively reduce trap catches.
For monitoring applications, this compound is usually blended with a smaller percentage of (E)-8-dodecen-1-ol to match the natural pheromone blend more closely. Mating disruption products may use slightly different formulations.
Supply comes primarily from China, with a handful of producers capable of meeting the isomer purity specifications demanded by the lure manufacturers in Europe and North America. Buyers should request isomer breakdown data in the COA, not just total purity.