Cover Feature: Three‐Component Castagnoli‐Cushman Reaction of 3‐Arylglutaconic Acid Anhydrides, Carbonyl Compounds, and Ammonium Acetate: a Quick and Flexible Way to Assemble Polysubstituted NH ‐δ‐lactams (Eur. J. Org. Chem. 11/2021)
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