It's hard to believe that the software doesn't allow the import of structures in common file formats, e.g. SDF/mol.
Public sources for the respective data are to be found at http://pubchem.ncbi.nlm.nih.gov/summary/summary.cgi?sid=7689 or http://www.ebi.ac.uk/chebi/chebiOntology.do?chebiId=CHEBI:27888