A thermosetting composition.

A thermosetting composition contains a functional resin with OH or NH2 groups, with a functionality of more than 2, and a crosslinking agent. The crosslinking agent is a carbonylbislactamate having a specific formula. A thermosetting composition contains a functional resin with OH or NH2 groups, with a functionality of more than 2, and a crosslinking agent. The crosslinking agent is a carbonylbislactamate having the formula (I). n = 3-15. Preferred Feature: The composition contains an acid or a base. An Independent claim is also included for the curing of a functional resin as above in the presence of a carbonylbislactamate.