A new entry for the synthesis of N-acyl-N′-substituted guanidines
Tetsuro Shinada, Taiki Umezawa, Tsuyoshi Ando, Hayato Kozuma, Yasufumi Ohfune
Tetrahedron Letters, Volume 47, Issue 12, 20 March 2006, Pages 1945-1947
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http://dx.doi.org/doi:10.1016/j.tetlet.2006.01.065