6-Isoquinolinecarboxylic acid, 5,7-dichloro-1,2,3,4-tetrahydro-, hydrochloride (1:1) is a quinoline derivative used in pharmaceutical synthesis.
5,7-Dichloro-1,2,3,4-Tetrahydroisoquinoline-6-Carboxylic Acid Hydrochloride, also known as Lifitegrast Impurity 5, is an impurity of Lifitegrast. Lifitegrast is a FDA approved drug for the treatment of keratoconjunctivitis sicca (dry eye syndrome). It is a tetrahydroisoquinoline derivative and lymphocyte function-associated antigen-1 ( LFA-1) antagonist that was discovered through the rational design process.