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

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