cannot get data for delisted stock

Hi, when I run the following command, I got "400 bad request". Do you know how I can get data for the delisted stock? thanks.

ek.get_data(['RAI.^G17'], ['TR.SgaExpenseTotal.Date','TR.SgaExpenseTotal'],{'SDate':'2013-01-01','EDate':'2015-12-31'})

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