The function returns a vector of available data sources used by ChemSpider.
Some ChemSpider functions allow you to restrict which sources are used to
lookup the requested query. Restricting the sources makes these queries
faster.
Usage
cs_datasources(apikey = NULL)
Arguments
apikey
character; your API key. If NULL (default),
cs_check_key() will look for it in .Renviron or .Rprofile.