發送短信 : Rational design and topochemical synthesis of polymorphs of a polymer

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