N-Isopropylnortropine methobromide-D3 is a labelled analogue of N-Isopropylnortropine methobromide (I872685). N-Isopropylnortropine methobromide is an impurity of Ipratropium (Bromide Monohydrate: I740500), an Atropine (A794625)-like bronchodilator that acts via an anticholinergic pathway, and is used to treat patients with chronic bronchitis, cardiac obstructive pulmonary disease (COPD) and asthma.