acetic acid,cyclopenta-1,3-diene-1,3-diol

3-乙氧基-2-环戊烯酮

3-甲基-2-环戊烯-1-酮

(E)-3-(4-hydroxy-3-methoxyphenyl)-N-(2-hydroxy-5-oxocyclopenten-1-yl)prop-2-enamide

2,2'-((4-hydroxyphenyl)methylene)bis(3-hydroxycyclopent-2-en-1-one)