1,3-DIOXANE 1,3-Dioxacyclohexane 1,3-Propanediol formal 505-22-6 CCRIS 5911 EINECS 208-005-1 HSDB 4263 NSC 139436 Trimethylene glycol methylene ether m-Dioxane m-Dioxin, dihydro- meta-Dioxane