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In N-butylthiophen-3-carboxamide, C9H13NOS, the N-butylcarboxamide group is almost planar with the aromatic thiophene ring, with the amide N atom cis to C2. In the 2-benzylseleno derivative, C16H19NOSSe, the N-butylcarboxamide group adopts an orientation with the amide O atom cis to C2 and forming a close contact with the Se atom. In both compounds the amide N atom is involved in hydrogen bonding with the O atom of an adjacent molecule forming zigzag chains.

Supporting information

cif

Crystallographic Information File (CIF)
Contains datablocks 1, 2, global

fcf

Structure factor file (CIF format)
Contains datablock 1

fcf

Structure factor file (CIF format)
Contains datablock 2

CCDC references: 128687; 128688

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