(E)-Cinnamaldehyde Dimethyl Acetal-d5 is the isotope analog of (E)-Cinnamaldehyde Dimethyl Acetal. (E)-Cinnamaldehyde Dimethyl Acetal is synthesized from trans-cinnamaldehyde (C442020) and is used for the preparation of benzyl(aryl)triazoles and their selective human aromatase (cytochrome P 450 19A1) inhibitory activity.