Diels-Alder Adducts of 3,6-Dibromophencyclone with Symmetrical 1,4-Disubstituted-Cis-2-Butenes: Comparisons with the Adduct of Phencyclone and N-Benzylmaleimide, and One-Dimensional and Two-Dimensional Nuclear Magnetic Resonance Studies and Ab Initio Structure Calculations
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