A substituted cyclohexanone undergoes base-catalyzed aldol cyclization and gives the following compound. Determine the structure of the starting diketone that would cyclize to form the product.

Cyclization product of a substituted cyclohexanone in aldol condensation.

Structure showing a substituted cyclohexanone with an aldehyde group.

Cyclization product of a substituted cyclohexanone with a ketone group.

Structure of a substituted cyclohexanone with two functional groups.