118292-41-4 3-Pyridinecarboxylic acid, 6-((3,4-dihydro-4,4-dimethyl-2H-1-benzothiopyran-6-yl)ethynyl)- 6-((3,4-Dihydro-4,4-dimethyl-2H-1-benzothiopyran-6-yl)ethynyl)-3-pyridinecarboxylic acid 6-(2-(4,4-Dimethylthiochroman-6-yl)ethynyl)nicotinic acid Agn 190299 Tazarotenic acid