Text this

Number:

Provider:

CAPTCHA:

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

Please enter what you see:

Text this: A facile approach for the asymmetric synthesis of oxindoles with a 3-sulfenyl-substituted quaternary stereocenter