4-[[(3-chloro-6-oxocyclohexa-2,4-dien-1-ylidene)-phenylmethyl]amino]butanoic acid

4-aminobutanoyl chloride

2-苯并噻唑丙胺(9ci)

4-[(4-nitrophenyl)methoxycarbonylamino]butanoic acid

4-[(6-oxocyclohexa-2,4-dien-1-ylidene)methylamino]butanoic acid