ethyl 2-benzamidocyclopentene-1-carboxylate

2-氧代环戊羧酸乙酯

ethyl 2-(2-phenylethynyl)cyclopentene-1-carboxylate

ethyl 2-prop-1-en-2-ylcyclopentene-1-carboxylate

(2-prop-1-en-2-ylcyclopenten-1-yl)methanol