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