4-[4-(2,4-difluorophenyl)phenyl]-2-methyl-4-oxobutanoic acid

(R)-(+)-甲基丁二酸

(S)-(-)-甲基丁二酸

2-苄基丙烯酸

1-苄基-5-氧-3-吡咯烷羧酸甲酯