1,3-Dioxolane, 4-methyl-2-(phenylmethyl)- 2-Benzyl-4-methyl-1,3-dioxolane 4-Methyl-2-benzyl-1,3-dioxolane 5468-05-3 EINECS 226-783-0 NSC 25477 Phenylacetaldehyde propyleneglycol acetal