.alpha.-Methylphenacetaldehyde dimethyl acetal 1,1-Dimethoxy-2-phenylpropane 2-Phenylpropanal dimethylacetal 2-Phenylpropionaldehyde dimethyl acetal 90-87-9 Benzene, (2,2-dimethoxy-1-methylethyl)- Hydratropaldehyde dimethyl acetal Hydratropaldehyde, dimethyl acetal Hydratropic aldehyde dimethyl acetal NSC46115