126-54-5 2,4,8,10-Tetraoxaspiro(5.5)undecane 2,4,8,10-Tetraoxaspiro[5.5]undecane 5,5'-Spirobi-1,3-dioxane 5,5'-Spirobi-m-dioxane AI3-23521 EINECS 204-792-0 Formaldehyde, cyclic diacetal with pentaerythritol NSC 139455 Pentaerythritol bisformal Pentaerythritol cyclic diformal Pentaerythritol diformal Pentaerythritol, bis(cyclic acetal) with formaldehyde Pentaerythritol, dimethylene-