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The crystal structure of the title co-crystal, 2C6H7N3O·C6H10O4, is a second polymorph, designated form II, of the co-crystal formed between the two mol­ecules [Lemmerer et al. (2011). CrystEngComm, 13, 55–59]. The asymmetric unit comprises one mol­ecule of nicotinic acid hydrazide, and one half-mol­ecule of adipic acid (the entire mol­ecule is completed by the application of a centre of inversion). In the crystal, mol­ecules assemble into a three-dimensional network of hydrogen bonds, formed by three N—H...O hydrogen bonds and one O—H...N hydrogen bond. The O—H...N hydrogen bond formed between the carboxyl group and the pyridine ring is supported by a C—H...O hydrogen bond.

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In the title co-crystal, C16H14N4O2·2C7H6O2, the 3,4-bis­[(pyridin-3-ylmeth­yl)amino]­cyclo­but-3-ene-1,2-dione squareamide mol­ecules assemble into chains along the b axis via N—H...O hydrogen bonds. The benzoic acid mol­ecules then hydrogen bond to the pyridine rings via O—H...N hydrogen bonds, supported by weaker C—H...O hydrogen bonds, forming extended ribbons. The asymmetric unit consists of a half squareamide mol­ecule, sitting on a special position around a twofold axis, and one benzoic acid mol­ecule on a general position.

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In the crystal structure of the title compound, C5H5BrN2, mol­ecules assemble via pairs of N—H...N hydrogen bonds into inversion dimers using only the syn H atom on the amine group. These dimers then assemble further into two-dimensional layers via type I C—Br...Br [Br...Br = 3.693 (s6) Å] halogen bonding along the (102) plane.

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The title compound, C18H27N3O, is a derivative of the anti­tuberculosis drug isoniazid (systematic name: pyridine-4-carbohydrazidei). The crystal structure consists of repeating C(4) chains along the b axis, formed by N—H...O hydrogen bonds with adjacent amide functional groups that are related by a b-glide plane. The cyclo­dodecyl ring has the same approximately `square' conformation, as seen in the parent hydro­carbon cyclo­dodecane.

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The title compound, C11H13N3O, is a derivative of the anti­tuberculosis drug isoniazid [systematic name: pyridine-4-carbohydrazide]. The crystal structure consists of repeating hydrogen-bonded chains parallel to the b axis. Adjacent mol­ecules in the chains are linked by bifurcated N—H...(O,N) hydrogen bonds, which form an R12(5) ring motif.

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In the title mol­ecular salt, C3H8N+·C7H4IO2-, the cyclo­propanaminium cation forms three hydrogen bonds to the 4-iodo­benzoate anion, forming two unique repeating R44(12) hydrogen-bonding rings that result in one-dimensional hydrogen-bonded columns along the crystallographic c axis.

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In the title compound, C6H7N3O, the amide group is rotated such that the carbonyl O atom is syn to the pyridine N atom, with an O—C—C—C torsion angle of −23.55 (18)°. The crystal packing involves four hydrogen bonds of the types N—H...N and N—H...O. Two separate centrosymmetric rings are formed using N—H...N and N—H...O hydrogen bonds that result in a ribbon of 6-aminonicotinamide molecules, joined by the amide and amine functional groups. The remaining two hydrogen bonds are used to generate a three-dimensional packing arrangement.

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In the crystal structure of the 1:1 title salt, C4H12NO2+·C6H4BrO, hydrogen-bonding inter­actions originate from the ammonium cation, which adopts a syn conformation. A gauche relationship between the C—O and C—N bonds of the 2-hy­droxy­ethyl fragments also facilitates O—H...O inter­actions of bis­(2-hy­droxy­eth­yl)ammonium cation chains to phenolate O atoms. The resulting double-ion chains along [100] are further linked by N—H...O inter­actions, forming chains parallel to [110].

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The asymmetric unit of the racemic title compound, C10H16N2S2, a C2-symmetric bis­(thiol­actam), contains one half-mol­ecule, the complete mol­ecule being generated by a twofold axis symmetry operation. The five-membered ring is nearly planar, with a maximum deviation of 0.025 (1) Å. In the crystal, the mol­ecules are linked via weak C—H...S inter­actions, forming infinite chains along the b-axis direction.

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The title compound, C21H21NO, is a vinyl­ogous amide (enaminone) produced by reaction of 1-(2-phenyl­prop-2-en-1-yl)pyrrolidine-2-thione with phenacyl bromide. In the mol­ecule, the phenyl rings are twisted from the mean plane of the pyrrolidine ring by 11.2 (1) and 67.3 (1)°. In the crystal, weak C—H...O hydrogen bonds link the mol­ecules related by translation along the b axis into chains.

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The asymmetric unit of the title compound, C12H10N2, which may serve as a model for mitosenes, contains two independent mol­ecules. The conformation of the five-membered rings in both molecules is envelope, with the central CH2—CH2—CH2 C atom at the flap in each case. In the crystal, they inter­act by a combination of weak C—H...N and π–π inter­actions [centroid–centroid distances = 3.616 (1) and 3.499 (1) Å] and C—H...π contacts.

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In the title hydrated mol­ecular salt, C5H7N2+·C7H3ClNO4·H2O, the ions and water mol­ecules assemble into ribbons of R65(22) rings along the c axis via O(water)—H...O, N+—H...O(water) and N—H...O hydrogen bonds. N—H...O hydrogen bonds connect adjacent ribbons along the c-axis direction via R44(12) rings, forming hydrogen-bonded layers. The CO2 and NO2 groups make dihedral angles of 81.8 (2) and 1.4 (2)°, respectively, with the ring in the anion.
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