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

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Text this: Ultrasonic-assisted synthesis of carbodiimides from N,N′-disubstituted thioureas and ureas