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

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Text this: Carbene-catalyzed selective addition of isothioureas to enals for access to sulphur-containing 5,6-dihyropyrimidin-4-ones