(2R)?-6-?(acetyloxy)?-?3,?4-?dihydro-?2,?8-?dimethyl-?7-?(methyl-?d3)?-?2-?[(4R,?8R)?-?4,?8,?12-?trimethyltridecyl]?-2H-?1-?Benzopyran-?5-?carboxaldehyde-?d4 is an intermediate in synthesizing γ-Tocopherol-d4 (T526142), a labelled γ-Tocopherol. One of the naturally occurring forms of Vitamin E. Most abundant Tocopherol in soybean and corn oils.