"CopySpecial"

This token has not been fully integrated into the long-term Mathematica system, and is subject to change.

is a front end token that converts the selection to a specified format and copies it to the clipboard.

"PlainText"	text with style information removed
"InputText"	plain ASCII text with added whitespace
"CopyAsTeX"	format
"MathML"	MathML format
"CellExpression"	one or more Cell expressions
"NotebookExpression"	a Notebook expression
"MGF"	Bitmap format; Windows only
"EMF"	Enhanced Metafile; Windows only
"WAV"	Wave format; Windows only

A typical use is FrontEndExecute[FrontEndToken[FrontEnd`SelectedNotebook[], "CopySpecial", "PlainText"]].