2-hydroxy-4-(2-hydroxy-4-methoxy-3,6-dimethylbenzoyl)oxy-3,6-dimethylbenzoic acid

1,1-二氟四氯乙烷

ethyl 2,4-dioxo-6-phenylcyclohexane-1-carboxylate

2-bromoethyl N,N-dimethylcarbamate

(carbonic acid ethyl ester)-cinnamic acid-anhydride