4-toluene-sulfonylmethyl isocyanide

9-(benzyloxy)-1-ethoxy-3-(ethoxycarbonyl)-7,8-dihydro-6H-cyclopent(g)isoquinolin-8-one

1-ethoxy-3-(ethoxycarbonyl)-7,8-dihydro-9-hydroxy-6H-cyclopent[g]isoquinolin-8-one

1-ethoxy-3-(ethoxycarbonyl)-5,5a,7,8-tetrahydro-9-hydroxy-6H-cyclopent(g)isoquinolin-8-one

9-(benzyloxy)-8-cyano-1-ethoxy-7,8-dihydro-6H-cyclopent(g)isoquinoline-3-carboxylic acid