2-cyclopent-2-en-1-ylphenol

2-(3-cyclopenta-2,4-dien-1-ylideneprop-1-enyl)furan

5-[8-[(2-methylpropan-2-yl)oxy]octan-2-ylidene]cyclopenta-1,3-diene

4-hydroxyspiro[2.4]heptan-7-one

(1R,2R,5S,6S)-tricyclo[4.2.1.02,5]non-7-ene-3,4-dione