1 ; atom renaming specification
2 ; residue gromacs forcefield
28 ; This mapping of O->OC2 and OXT->OC1 might look a bit strange,
29 ; but when we rebuild an oxygen it will be placed directly after C, so
30 ; this mapping makes sure OC1 comes before OC2. The oxygens are anyway chemically
31 ; equivalent, and if you already had their coordinates present they will be kept intact.