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The title compound, C29H26N2OP, containing four planar ring systems, exists in the Z form. The short C...O [2.711 (3) Å] and C...N [2.961 (3) and 2.997 (3) Å] intramolecular contacts may indicate the presence of weak intramolecular hydrogen bonds.

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The title compound, C18H16N2OS, crystallizes in a triclinic unit cell with two independent mol­ecules in the asymmetric unit. Intermolecular N—H...S, C—H...O and C—H...S hydrogen bonds link the mol­ecules into ribbons, which form stacks with short intra- and intermolecular S...C [3.385 (5) Å] and C...O′ [3.162 (5) Å] contacts.

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The title compound, C30H28NO3P, containing four planar ring systems, exists in the Z form. Short intra­molecular C...O [2.697 (3) Å] and C...N [3.049 (4) Å] contacts may indicate the presence of weak intra­molecular hydrogen bonds.

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The title compound, C29H25ClNO2P, exists in the Z form. The short C...O [2.700 (4) Å] and C...N [2.963 (4) Å and 2.988 (5) Å] intra­molecular contacts may indicate the presence of weak intra­molecular hydrogen bonds.

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In the title compound, C17H14N4OS, the central heterocyclic system formed by the five-membered triazole and thia­diazole rings is planar. The bond lengths within the system indicate some degree of delocalization.
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