[ None ] [ COO- ] [ replace ] C Abis 12.011 0.64 [ add ] 2 8 O C CA N Obis 15.9994 -0.42 [ delete ] O [ dihedrals ] N CA C O2 [ impropers ] CA O2 C O1 improper_X_X_A_X N C CA CB improper_X_X_C_X [ COOH ] [ replace ] C Aprime 12.011 0.38 O OH 15.9994 -0.38 [ add ] 1 2 OT C CA N O 15.9994 -0.433 1 2 HO O C CA HO 1.008 0.433 [ dihedrals ] N CA C O1 [ impropers ] O2 CA C O1 improper_X_X_A_X