(1R,3S)-3-((2R,5S)-5-Benzyloxymethyl-1-tert-butoxycarbonyl-pyrrolidin-2-yl)-1-formyl-8-methoxy-3,4-dihydro-1H-isoquinoline-2-carboxylic acid 2,2,2-trichloro-ethyl ester

3-<(2R,5S)-5-benzyloxymethyl-1-tert-butoxycarbonylpyrrolidin-2-yl>-1-<(4R,5R)-5-methoxymethoxymethyl-2,2-dimethyl-1,3-dioxolan-4-yl>-8-methoxyisoquinoline

(1R,3R)-2,2,2-trichloroethyl 3-<(2R,5S)-5-benzyloxymethyl-1-tert-butoxycarbonylpyrrolidin-2-yl>-1-<(4R,5R)-5-methoxymethoxymethyl-2,2-dimethyl-1,3-dioxolan-4-yl>-8-methoxy-3,4-dihydro-2(1H)-isoquinolinecarboxylate

(1R,3R)-2,2,2-trichloroethyl 1-acetoxymethyl-3-<(2R,5S)-1-tert-butoxycarbonyl-5-formylpyrrolidin-2-yl>-8-methoxy-3,4-dihydro-2(1H)-isoquinolinecarboxylate

(1R,3R)-2,2,2-trichloroethyl 1-acetoxymethyl-3-<(2R,5S)-1-tert-butoxycarbonyl-5-hydroxymethylpyrrolidin-2-yl>-8-methoxy-3,4-dihydro-2(1H)-isoquinolinecarboxylate