methyl (E)-4-oxo-4-(p-tolylamino)but-2-enoate

3,4-二氢-3-氧-2H-1,4-苯噻嗪-2-乙酸

1-(4-甲基苯基)-1H-吡咯-2,5-二酮

5-(4-methylphenyl)iminofuran-2-one