Nancy Druze 3. Opening a flip-top box to push a flashing red button will stop a variation of this reaction from producing pyridines from imines. Scientists performing this reaction often receive phone calls from a silhouetted figure offering them money if they do not use a compound named after Danishefsky in its “aza” variant. In this reaction, an “endo” preference causes substituents to point towards the model holding the suitcase containing the dienophile. For 10 points, name this four-plus-two cycloaddition performed by Howie Mandel.