for the following products
(S)-1,2,3,4-Tetrahydro-6,7-dimethoxyisoquinoline-3-carboxylic acid benzyl ester | Benzyl 6,7-dimethoxy-1,2,3,4-tetrahydroisoquinoline-3-carboxylate and (S)-1,2,3,4-Tetrahydro-6,7-dimethoxy-3-isoquinolinecarboxylic acid benzyl ester p-toluenesulfonate salt
