See the ChemSpider API documentation for more details.
>>> cs.construct_api_url('MassSpec', 'GetExtendedCompoundInfo', csid='2157') u'http://www.chemspider.com/MassSpec.asmx/GetExtendedCompoundInfo?csid=2157'
Get a list of data sources in ChemSpider:
>>> cs.get_databases()
['Abacipharm', 'Abblis Chemicals', 'Abcam', 'ABI Chemicals', 'Abmole Bioscience', 'ACB Blocks', 'Accela ChemBio', ... ]