Quotes name doubt

I am able to understand the normal quotes of Nifty like this-NIFTY22APR15200PE.
But some quotes are like the following NIFTY2231715000CE. Please help me understand what does they mean.
Also I am receiving empty dictionary for the quote of 17th March options of nifty. I am using the follwing code for the quote-
Please help me out.
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