118292-40-3 3-Pyridinecarboxylic acid, 6-((3,4-dihydro-4,4-dimethyl-2H-1-benzothiopyran-6-yl)ethynyl)-, ethyl ester AGN 190168 Ethyl 6-((4,4-dimethylthiochroman-6-yl)ethynyl)nicotinate TAZAROTENE Tazarotene [USAN:INN] Tazorac Zorac