2,4,4-trimethyl-2-cyclopenten-1-one

3-(Hydroxymethyl)-2,4,4-trimethyl-2-cyclopenten-1-on

2,4,4-trimethyl-3-((phenylsulfonyl)methyl)cyclopent-2-enone

5-hydroxy-2,4,4-trimethyl-3-[3,7,12,16-tetramethyl-18-(3-oxocyclopenten-1-yl)octadeca-1,3,5,7,9,11,13,15,17-nonaenyl]cyclopent-2-en-1-one

2,2'-dinorcanthaxanthin