Conformational analysis of acetamide pair at the bound state; A) average hydrogen bonds formed between acetamide pair and water molecules as a function of bilayer normal distance, B) fraction of conformations that form one intra-pair hydrogen bond, C) fraction of conformations forming two intra-pair hydrogen bonds; The results of explicit (blue), HDGB (red), GBSW (green), and IMM1 (purple) are compared.