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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