The Camomila extract also contains a bicyclic acetylenic ether which causes some toxicity as a result of its spasmolitic properties.    From Wordnik.com.  [Chapter 12] Reference

This very simple process - which requires a minimum of equipment, is quite safe and usually needs but little supervision - then seemed to be applicable to a whole series of important cases, namely the transformation of unsaturated ethylenic or acetylenic hydrocarbons into saturated hydrocarbons, and the transformation of nitro derivatives into arnines.    From Wordnik.com.  [Paul Sabatier - Nobel Lecture] Reference

Third-generation acetylenic retinoids developed in the 1980s allowed for the production of a topical retinoid, tazarotene, with demonstrated anti-psoriatic efficacy.    From Wordnik.com.  [ReadABlog.com New Blogs and RSS Feeds] Reference