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Details of the crystal structures of 1–3. Note the two crystallographically independent molecules (A, B) in 3. Intramolecular Se⋅⋅⋅Se distances amount to 3.245(1) Å in 1, 3.237(1) Å in 2, and 3.216(6) and 3.221(7) Å in 3A and 3B respectively.
