5-(2,2-diMethyl-4H-benzo[d][1,3]dioxin-6-yl)oxazolidin-2-one

5-(2,2-Dimethyl-4H-1,3-benzo[d][1,3]dioxin-6-yl)oxazolidin-2-one is a vilanterol impurity and a reagent for preparation of f conjugate of G-protein coupled receptor binding ligand and nucleic acid molecules.