[1,3]二氧杂环戊并[4,5-g]苯并吡喃-6-酮

pyrazolo[1,5-a]pyrazine-3-carboxylic acid

ethyl 4-oxo-4-phenylbut-2-ynoate

乙基4-氧代-2-戊炔酸酯

5,6,7-三甲氧基香豆素