4-cyclopropylmethylene-2-phenyl-4H-oxazol-5-one

cyclopropylacetamidomalonic acid

diethyl cyclopropylacetamidomalonate

(1S)-1-methyl-2-oxo-2-tetrahydro-1H-pyrrolylethyl 2-bromo-3-cyclopropylpropanoate

(S)-2-Benzyloxycarbonylamino-3-cyclopropyl-propionic acid benzyl ester