Highly Regio‐ and Diastereoselective 1,3‐Dipolar Cycloaddition of Nitrile Oxides to 2,4‐Dimethyl‐3H‐1,5‐Benzodiazepines: Synthesis of Bis[1,2,4‐Oxadiazolo][1,5]Benzodiazepine Derivatives

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