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1H NMR spectral analysis of A) 8 a, B) 7 and C) 9 a in CDCl3 to confirm the successful synthesis of 9 a by click chemistry. The peaks marked with ⧫, ▾ and ★ belong to the characteristic NMR signals from protons of methylene linked to an azide group in 8 a, alkynyl terminals in 7 and triazole rings in the terminal part of 9 a, respectively.
