4-苄基-2-苯基-2-噁唑啉-5-酮

2.2-difluoro-4-pentenoic acid anhydride

4-benzyl-4-(2,2-difluoropent-4-enoyl)-2-phenyloxazol-5(4H)-one

2,2-二氟-4-戊烯酸

2.2-difluoro-4-pentenoic acid