static void Main(string[] args) { string file = File.ReadAllText("1hho.cif"); // downloaded from http://www.rcsb.org/pdb/explore.do?structureId=1HHO (PDBx/mmCIF Format9 using (var reader = new ModelReader()) { var entry = reader.ReadEntry(file); foreach (var atomSite in entry.AtomSites) { Console.WriteLine( atomSite.Symbol + " Position: " + atomSite.X + "/" + atomSite.Y + "/" + atomSite.Z ); } } Console.ReadKey(); }