4,6-Dihydroxy-2-[(3-hydroxy-4-methoxyphenyl)methylene]-3(2H)-benzofuranone-d3 is an intermediate in synthesizing Diosmetin 3’,7-Diglucuronide-d3 (D485042), a labelled Diosmetin 3’,7-Diglucuronide (D485040), which is a metabolite of Diosmetin (D485000) which is a flavonoid often administered in the treatment of chronic venous insufficiency, hemorrhoids, and related affections.