Metaproterenol-d 7 -1 (hemisulfate) is deuterium labeled Metaproterenol (hemisulfate). Metaproterenol hemisulfate (Orciprenaline hemisulfate) is a direct-acting sympathomimetic and a β2-adrenergic receptor (β2AR) agonist with an IC 50 of 68 nM. Metaproterenol hemisulfate also has anti-inflammatory activity.