The fragment 124 (cyclopropane) is surrounded by ARG143, GLU147, LYS148, and GLN192 of factor Xa in PDB 2VWM. These four residues are located at the lower ranking positions of the interaction profile of fragment 124, 18th, 19th, 16th and 13th, respectively. It is therefore not in its most favorable environment according to its fragment-residues interaction profile.