ethyl N-[(2-aminobenzoyl)amino]carbamate

ethyl N-[1-(4-methoxyphenyl)ethylideneamino]carbamate

ethyl (E)-3-(4-acetyloxyphenyl)prop-2-enoate

ethyl N-[bis(2-chloroprop-2-enyl)amino]carbamate

4-苯基脲唑