This ketene then dimerizes to form a four-membered ring with two ketone groups.

The functional groups with the highest precedence are the two ketone groups.

The numbering of the molecule is based on the ketone groups.

When numbering from left to right, the ketone groups are numbered 3 and 9.

When numbering from right to left, the ketone groups are numbered 15 and 21.

It has one ketone group and so is part of the ketose family.

A ketose is a sugar containing one ketone group per molecule.

The ketone group is then reduced by means of zinc and ammonium hydroxide.

Aminoketones are compounds containing both a ketone group and an amine.