Metaproterenol-d 7 (hemisulfate) is the deuterium labeled Metaproterenol hemisulfate. Metaproterenol hemisulfate (Orciprenaline hemisulfate) is a direct-acting sympathomimetic and a β2-adrenergic receptor (β2AR)agonist with an IC50 of 68 nM. Metaproterenol hemisulfate also has anti-inflammatory activity.