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The Se...O distance of 2.302 (3) Å in the title compound, combined with a longer than usual amide C=O bond of 2.252 (5) Å, suggest a significant inter­action between the amide O atom and its adjacent Se atom. An analysis of related structures containing an Se—Se...X unit (X = Se, S, O) shows a strong correlation between the Se—Se bond length and the strength of the Se...X inter­action.
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