3-(4-Cyano-phenyl)-2-formylamino-2-methyl-propionic acid methyl ester
2-Formylamino-2-methyl-3-(4-methylsulfanylcarbonimidoyl-phenyl)-propionic acid methyl ester
2-Formylamino-2-methyl-3-(4-thiocarbamoyl-phenyl)-propionic acid methyl ester
α-methyl-4-thiocarbamoylphenylalanine methyl ester