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In the title compound, C18H26N4OS, the imine C=N bond has a Z configuration, whereas the N—N—C=S unit has an E conformation. In the crystal, mol­ecules are connected through N—H...O hydrogen bonds, forming zigzag chains running along the b axis. The nonyl chain adopts an extended zigzag conformation.

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In the title 1-alkyl­isatin 3-thio­semicarbazone, C19H28N4OS, the imine C=N bond has a Z configuration, whereas the N—N—C=S unit has an E conformation. In the crystal, mol­ecules are connected by N—H...O hydrogen bonds, forming zigzag chains running along the b axis.

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In the title N-alkyl isatin, C22H33NO2, the isatin moiety is planar (r.m.s. deviation = 0.03 Å). The tetra­decyl substituent has all torsion angles in an anti­periplanar conformation.

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In the title N-alkyl isatin, C18H25NO2, the isatin moiety is almost planar (r.m.s. deviation = 0.03 Å). C-C-C-C torsion angles of the decyl substituent indicate an all-antiperiplanar conformation.
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