2-Cyano-3-(3-chlorophenylethyl)pyridine-d5 is the labeled analogue of 2-Cyano-3-(3-chlorophenylethyl)pyridine (C962450), a Loratadine (L469575) intermediate. Loratadine (L469575) is a nonsedating-type histamine H1-receptor. Loratadine (L469575) is an important active pharmaceutical ingredient used in a wide variety of prescription and over-the-counter products for the treatment and relief of allergy symptoms.