NSC19005 (Betahistine EP Impurity C) is an impurity of Betahistine and is structurally related to Betahistine. NSC19005 is a dimer of Betahistine. Betahistine is a potent, orally bioactive and well-tolerated histamine H1
receptor agonist and H3 receptor antagonist used for the study of
rheumatoid arthritis (RA).