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4-(2-Pyrrolidin-1-yl-phenylcarbamoyl)-butyric acid

4-(2-Pyrrolidinyl)-pyrimidine

4-(2-Quinoxalinylamino)benzenecarboxylic acid

4-(2-Quinoxalinylamino)benzoic acid ethyl ester

4-(2-Tert-butoxycarbonylamino-2-imino-ethyl)-benzoic acid

4-(2-Tert-butoxycarbonylamino-3-phenyl-propionylamino)-butyric acid

4-(2-Tert-butoxycarbonylamino-ethoxy)-benzoic acid

4-(2-Tetrahydro-1H-pyrrol-1-ylethyl)pyridine

4-(2-Thiazolin-2-yl)phenol

4-(2-Thiazolyl)aminocarbonylphenylboronic acid