for the following products
6,7-Dimethoxy-1,2,3,4-tetrahydroisoquinoline-3-carboxylic acid hydrochloride | S-6,7-Dimethoxy-1,2,3,4-tetrahydro-3-isoquinolinecarboxylic acid hydrochloride and 1,2,3,4-Tetrahydro-6,7-dimethoxy-3-isoquinolinecarboxylic acid hydrochloride
