1,3-Dioxane, 2,2,5,5-tetramethyl-4-(1-methylethyl)- 2,2,5,5-Tetramethyl-4-isopropyl-1,3-dioxane 4-Isopropyl-2,2,5,5-tetramethyl-1,3-dioxane 61920-45-4 EINECS 263-322-2