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

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Text this: N-bromosuccinimide promoted one-pot synthesis of guanidine: Scope and mechanism