search for implied volatility in datastream

Dear Sir/Madam,

I was trying to look for the implied volatility time series for the companies such as starbucks. In the datastream excel, when I typed the VL (symbol for implied volatility) for Starbucks, it comed out with 'error, invalid code or expression entered'. Can I actually get the data of implied volatility time series of companies through TR? If so how can I do that. Thanks for your time.

Best,

Allen