Text this

Number:

Provider:

CAPTCHA:

  ______     ___     __   __     ___      ______  
 /_   _//   / _ \\   \ \\/ //   / _ \\   /_   _// 
   | ||    / //\ \\   \   //   | / \ ||  `-| |,-  
  _| ||   |  ___  ||  / . \\   | \_/ ||    | ||   
 /__//    |_||  |_|| /_//\_\\   \___//     |_||   
 `--`     `-`   `-`  `-`  --`   `---`      `-`'

Please enter what you see:

Text this: A direct catalytic asymmetric Mannich-type reaction via a dinuclear zinc catalyst: Synthesis of either anti- or syn-α-hydroxy-β-amino ketones