Crystal and molecular structure of the N,N-dimethylurea derivatives of exo-5-ethoxy-5-isocyanatobicyclo[2.1.0]pentane and exo-6-ethoxy-6-isocyanatobicyclo[3.1.0]hexane. Confirmation of the .gamma.-steric shift in nitrogen-15 nuclear magnetic resonance as a tool for stereochemical assignment

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