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

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Text this: Carbene-catalyzed reaction of indolyl methylenemalononitriles and enals for access to complex tetrahydrocarbazoles