The cyclization of the intermediate product obtained is made thanks to the Agissement of phosphoric acid. This cyclization gives birth to two isomers : Iso E Super® and Arborone, in 95/5 narration. These are really good. I hear that there are much more expensive interprétation of a few of these, https://isoesuper19754.total-blog.com/5-faits-simples-sur-la-parfum-d-ambiance-d-crite-43110715