2-Methoxybenzaldehyde-d3 is the isotope labelled analog of 2-Methoxybenzaldehyde (M260980); a compound used in the synthesis of stilbene and dihydrostilbene derivatives as potential anticancer agents. 2-Methoxybenzaldehyde is also used in the synthesis of highly functionalized pyrrolidines as potent angiotensin converting enzyme inhibitors.