2-[2-(6-Bromohexyloxy)ethoxymethyl]-1,3-dichlorobenzene-d4 is the isotope labelled analog of 2-[2-(6-Bromohexyloxy)ethoxymethyl]-1,3-dichlorobenzene which is an intermediate in the synthesis of Vilanterol Trifenatate-d4 (V260002). Vilanterol Trifenatate (V260000) is a long-acting β2 adrenergic receptor Agonist. It demonstrates prolonged bronchodilation in subjects with asthma and COPD. Molecular Formula: C15H17D4BrCl2O2 Solubility: Dichloromethane, Ethyl Acetate, Hexane, Methanol Molecular Weight: 388.16