أرسل هذا في رسالة قصيرة: An Expeditious and Green Synthesis of 3,3¢-(Arylmethylene)-bis-(4-hydroxycoumarins) Catalyzed by 5-Sulfosalicylic Acid

             ___     __   _     _____     ____    
    ___     / _ \\  | || | ||  |  ___||  |  _ \\  
   /   ||  / //\ \\ | '--' ||  | ||__    | |_| || 
  | [] || |  ___  ||| .--. ||  | ||__    | .  //  
   \__ || |_||  |_|||_|| |_||  |_____||  |_|\_\\  
    -|_|| `-`   `-` `-`  `-`   `-----`   `-` --`  
     `-`