2-Methoxy-4-(4-methyl-1,3-dioxolan-2-yl)phenol 68527-74-2 EINECS 271-279-6 Phenol, 2-methoxy-4-(4-methyl-1,3-dioxolan-2-yl)- Vanillin propylene glycol acetal Vanillin propyleneglycol acetal