SEARCH Articles Figures Tables Ether, benzhydryl 2-chloroethyl ethyl ethynyl Ethyl 2- ethynyl ether Ethynylation Ethynyls Tazarotene (ethyl 6-2-(4,4-dimethylthiochroman-6-yl)-ethynyl nicotinate, 5, Tazarac, Avage and Zorac Allergan)