MDL Molfiles (or Molfiles for short) are files with the extension of .mol and are particularly useful in containing information about 2D structure of molecules, although they can also hold 3D information.
↑Dalby, A; Nourse, JG; Hounshell, WD; Gushurst, AKI; Grier, DL; Leland, BA; Laufer, J (1 May 1992). "Description of several chemical structure file formats used by computer programs developed at Molecular Design Limited". Journal of Chemical Information and Modeling32 (3): 244–255. doi:10.1021/ci00007a012.