5'-amino-4'-hydroxyspiro[1H-indole-3,2'-furan]-2,3'-dione

2-[N-(cyanomethyl)anilino]-5-methoxybenzoic acid

5-(N-methoxy-C-methylcarbonimidoyl)-5-methylimidazolidine-2,4-dione

2-(4-formyl-1H-indol-3-yl)acetonitrile

1-[2-(1H-indol-3-yl)ethyl]-3,6-dihydro-2H-pyridine-6-carbonitrile