MOL file format

The MOL file format is used to encode chemical structures, substructures and conformations as text-based connection tables. It is used by MDL Information Systems Inc. (e.g., in their MACCS or ISIS programs).
Source:
PAC, 1997, 69, 1137 (Glossary of terms used in computational drug design (IUPAC Recommendations 1997)) on page 1146
See also:
molfile
PAC, 1997, 69, 1137 (Glossary of terms used in computational drug design (IUPAC Recommendations 1997)) on page 1147