Structure characterized by single crystal X-ray analysis: CCDC 891446, 891452, 891447, 891453, 891454, 891448, 891449, 891451, 891450 contain the supplementary crystallographic data for compounds 2a, 4, 5, 6, 7, 8, 11, 13 and 14, respectively. These data can be obtained free of charge from The Cambridge Crystallographic Data Centre via www. ccdc. cam. ac. uk/data_request/cif.
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