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(A) Energy-minimized structures of DB2447, DB2448, and DB2502 at B3LYP/6-31G* (p,d) level of theory. In the electrostatic potential maps, red indicates high electronegativity and blue indicates electron-deficient/positively charged regions. (B) Molecular curvatures for DB2447, DB2448, and DB2502. Black circles represent reference circles and orange lines represent two straight lines drawn from the circle point at the center of the molecule to the amidine carbons.
