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A series of eight N-mono-substituted aryl acylguanidines L1~8 were synthesized from the reactions of their parent acylthioureas and respective primary amines, including five R1C(O)N=C(NHR2)2 with balanced arms(denoted as R1–R2–R2: Ph–Ar’–Ar’, L1(1);Ph–Ar’