1-hex-5-en-2-yl-4,4-dimethylcyclopent-2-en-1-ol

5,5,5',5'-tetramethyl-[1,1'-bi(cyclopentan)]-3-ene-2,3'-dione

4,4-二甲基环戊烯

ethyl 2-(1-hydroxy-4,4-dimethylcyclopent-2-en-1-yl)acetate

2,2-dimethyl-4-oxocyclopentane-1-carboxylic acid