2-phenylsulfanylbutanedioic acid

4-oxo-4-(2,2,2-trifluoroethylamino)but-2-enoic acid

(2Z,2'Z)-4,4'-[sulfonylbis(benzene-4,1-diylimino)]bis(4-oxobut-2-enoic acid)

3-phenylsulfanylfuran-2,5-dione

(Z)-3-(苯胺基氨基甲酰)丙-2-烯酸