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The title compound, C8H6FNO2, is almost planar (r.m.s. deviation for the non-H atoms = 0.019 Å) and the conformation across the C=C bond is trans. The C and H atoms of the side chain are disordered over two sets of sites in a 0.56 (3):0.44 (3) ratio. In the crystal, mol­ecules are linked by C—H...O inter­actions, thus forming C(5) chains propagating in [001].

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In the title compound, C18H18N2O4S, the dihedral angle between the aromatic rings is 33.71 (9)° and an intra­molecular C—H...O hydrogen bond closes an S(6) ring. In the crystal, mol­ecules are linked by C—H...O and C—H...N hydrogen bonds to generate a three-dimensional network. A very weak aromatic π–π stacking inter­ction is also observed [centroid–centroid separation = 3.9524 (10) Å].
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