[6-(4-Carbamimidoyl-phenylethynyl)-1-oxo-3,4-dihydro-1H-isoquinolin-2-yl]-acetic acid tert-butyl ester

{6-[4-(tert-Butoxycarbonylamino-imino-methyl)-phenylethynyl]-1-oxo-3,4-dihydro-1H-isoquinolin-2-yl}-acetic acid tert-butyl ester

(1-Oxo-6-trifluoromethanesulfonyloxy-3,4-dihydro-1H-isoquinolin-2-yl)-acetic acid tert-butyl ester

(6-Benzyloxy-1-oxo-3,4-dihydro-1H-isoquinolin-2-yl)-acetic acid tert-butyl ester

6-hydroxy-3,4-dihydro-1-oxo-2(1H)-isoquinolineacetic acid 1,1-dimethylethyl ester