(S)‐6,7‐dimethoxy‐1,2,3,4-tetrahydroisoquinoline‐3‐carboxylate hydrochloride
(S)-1,2,3,4-tetrahydro-6,7-dimethoxy-2-(tert-butyloxycarbonyl)-3-isoquinolinecarboxylic acid benzyl ester
(S)-1,2,3,4-tetrahydro-6,7-dimethoxy-3-isoquinolinecarboxylic acid, phenylmethylester, hydrochloride