Question: The major product formed by intermolecular aldol cyclization of 2,5-heptanedione has two singlet absorptions in the 1 H NMR spectrum at 16.5 and 1.90

The major product formed by intermolecular aldol cyclization of 2,5-heptanedione has two singlet absorptions in the ¹H NMR spectrum at 16.5 δ and 1.90 δ, and has no absorption in the range 3 to 10 δ. What is its structure?

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