Remir G. Kostyanovsky , Yury I. El'natanov , Oleg N. Krutius , Ivan I. Chervin and Konstantin A. Lyssenko
α,α'-Diamino-α,α'-dicarboxyadipic acid tetraester has been synthesised for the first time; it spontaneously cyclises into a monolactam and, under the action of bases, into a dilactam; the latter forms in the crystal a heterochiral hydrogen-bonded polymer of the linear zig-zag type.