SEARCH Articles Figures Tables 2- imidazolidines 2-Imidazolidine Imidazolidin Imidazolidin-2-one Imidazolidin-2-ones, chiral, Diels-Alder Imidazolidin-2-ones, chiral, Diels-Alder reaction Imidazolidine-2-ones