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