1-(4-propan-2-ylidenecyclopenten-1-yl)ethanone

[4-(1-hydroperoxy-1-methylethyl)-1,3-cyclopentadien-1-yl]-1-ethanone

6a-acetyl-3,3a,4,6a-tetrahydro-2',2'-dimethyl-spiro[cyclopentapyrazol-4,2'-oxiranel]