Calculate the index of hydrogen deficiency (degrees of unsaturation) for the following molecular formula, and propose a

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Question:

Calculate the index of hydrogen deficiency (degrees of unsaturation) for the following molecular formula, and propose a structure for this compound consistent with the following MS, ¹H NMR, and ¹³C NMR.

MS:

¹H NMR : (The numbers at the top are the integration values.)

¹³C NMR: