!standard angle restraints for amino acids using flexible rigid bodies - Engh & Huber F 1.5 S * 116.20 2.00 CA C N+ S * 123.00 1.60 O C N+ S * 121.70 1.80 C N+ CA+ S PRO 104.53 2.00 CA CB CG S PRO 106.07 2.00 CB CG CD