أرسل هذا في رسالة قصيرة: Formal Diels-Alder reactions of chalcones and formylcyclopropanes catalyzed by chiral N-heterocyclic carbenes

  ______    _____     ______    ______    ______  
 /_   _//  |  ___||  /_____//  /_   _//  /_   _// 
 `-| |,-   | ||__    `____ `    -| ||-     | ||   
   | ||    | ||__    /___//     _| ||_    _| ||   
   |_||    |_____||  `__ `     /_____//  /__//    
   `-`'    `-----`   /_//      `-----`   `--`     
                     `-`