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

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

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