How do I use ChemDraw to search the Chemical Abstracts database?
STN Express is an application used to search through the Chemical Abstracts database. To work between STN Express and ChemDraw Pro you must use the SMD file format. To work between STN Express and Chem3D Pro you need to use the Alchemy file format (STN Express may not be required in order to access Alchemy file formats on CAS).
Note: STN Express supports other file formats (MDL Molfile, etc).