أرسل هذا في رسالة قصيرة: Synthesis of dihydrogambirtannine by alkyne [2 + 2 + 2]-cyclotrimerisation

 _    _    __   __   _____      _____    _    _   
| || | ||  \ \\/ // |  __ \\   |  ___|| | |  | || 
| || | ||   \ ` //  | |  \ ||  | ||__   | |/\| || 
| \\_/ ||    | ||   | |__/ ||  | ||__   |  /\  || 
 \____//     |_||   |_____//   |_____|| |_// \_|| 
  `---`      `-`'    -----`    `-----`  `-`   `-`