In the title compound, C₁₁H₈N₂O₂, the packing is consolidated by C—HN and C—HO inter­actions.

The title compound, C₂₀H₁₇N₃O₂S₂, was synthesized by the reaction of 2-(1,5-diphenyl-1H-pyrazol-3-yl­oxy)acetic acid and thia­zolidine-2-thione. The C-linked benzene ring, N-linked benzene ring and thia­zolidine-2-thione ring are twisted 31.33 (2), 62.87 (1) and 82.71 (2)°, respectively, from the plane of the bridging 1H-pyrazole ring. The phenyl rings are oriented at a dihedral angle of 72.16 (2)°.

In the title compound, [Cu(C₁₄H₈O₅)(C₁₂H₁₂N₂)(H₂O)]_n, the Cu^II ion is penta­coordinated in a square-pyramidal geometry. Two N atoms of the chelating 5,5′-dimethyl-2,2′-bipyridine (dbp) ligand and two O atoms of two different 2,2′-oxydibenzoic (odb) ligands occupy the basal plane while the water O atom completes the square-pyramidal geometry at the apical site. The non-water N₂O₂ donor atoms are nearly coplanar, with a mean deviation from the least-squares plane of 0.0518 (11) Å and the Cu atom is displaced by 0.1507 (11) Å from this plane towards the apical water O atom. Further coordination via the 2,2′-oxydibenzoate anions forms a one-dimensional coordination polymer extending parallel to [010]. In the crystal structure, O—HO hydrogen bonds link the mol­ecules into a two-dimensional supra­molecular structure.

The title compound [systematic name: 4-amino-1-(2-de­oxy-β-D-erythro-pentofuranos­yl)-5-ethynylpyrimidin-2(1H)-one], C₁₁H₁₃N₃O₄, shows two conformations in the crystalline state. The N-glycosylic bonds of both conformers adopt similar conformations, with χ = −149.2 (1)° for conformer (I-1) and −151.4 (1)° for conformer (I-2), both in the anti range. The sugar residue of (I-1) shows a C2′-endo envelope conformation (²E, S-type), with P = 164.7 (1)° and τ_m = 36.9 (1)°, while (I-2) shows a major C3′-exo sugar pucker (C3′-exo-C2′-endo, ₃T², S-type), with P = 189.2 (1)° and τ_m = 33.3 (1)°. Both conformers participate in the formation of a layered three-dimensional crystal structure with a chain-like arrangement of the conformers. The ethynyl groups do not participate in hydrogen bonding, but are arranged in proximal positions.

The title compound {systematic name: 4-amino-1-(2-de­oxy--D-erythro-pentofuranosyl)-5-[6-(1-benzyl-1H-1,2,3-triaz­ol-4-yl)hex-1-yn­yl]pyrimidin-2(1H)-one}, C₂₄H₂₈N₆O₄, shows two conformations in the crystalline state, viz. (I-1) and (I-2). The pyrimidine groups and side chains of the two conformers are almost superimposable, while the greatest differences between them are observed for the sugar groups. The N-glycosylic bonds of both conformers adopt similar anti conformations, with = -168.02 (12)° for conformer (I-1) and = -159.08 (12)° for conformer (I-2). The sugar residue of (I-1) shows an N-type (C3'-endo) conformation, with P = 33.1 (2)° and _m = 29.5 (1)°, while the conformation of the 2'-de­­oxy­ribofuranosyl group of (I-2) is S-type (C3'-exo), with P = 204.5 (2)° and _m = 33.8 (1)°. Both conformers participate in hydrogen-bond formation and exhibit identical patterns resulting in three-dimensional networks. Inter­molecular hydrogen bonds are formed with neighbouring mol­ecules of different and identical conformations (N-HN, N-H O, O-HN and O-HO).

In the title compound, {[Zn₃(C₉H₃O₆)₂(C₁₂H₁₂N₂)₂(H₂O)₆]·6H₂O}_n, one Zn^II atom, lying on an inversion center, is six-coordinated by two O atoms from two benzene-1,3,5-tricarboxyl­ate (btc) ligands and four water mol­ecules in a distorted octa­hedral geometry. The other Zn^II atom is five-coordinated by two N atoms from a 5,5′-dimethyl-2,2′-bipyridine (dmbpy) ligand, two O atoms from two btc ligands and one water mol­ecule in a distorted trigonal–bipyramidal geometry. The compound features a one-dimensional ladder structure, with windows of ca 10.245 (1) × 15.446 (2) Å. The ladders are linked together by inter­molecular O—HO hydrogen bonds and π–π inter­actions between the benzene rings and between the pyridine rings [centroid-to-centroid distances 3.858 (2) and 3.911 (3) Å, respectively] to form a three-dimensional supra­molecular structure. One of the lattice water molecules is disordered over two positions in a 0.592:0.408 ratio.

In the title compound, [Ni(C₉H₄O₆)(C₁₂H₁₂N₂)(H₂O)₂]·7H₂O, the Ni^II atom is six-coordinated by two O atoms from a chelating carboxyl­ate group of a 5-carb­oxy­benzene-1,3-dicarboxyl­ate ligand, two O atoms of two water mol­ecules and two N atoms from a 6,6′-dimethyl-2,2′-bipyridine ligand in a distorted octa­hedral geometry. The compound exhibits a three-dimensional supra­molecular structure composed of the complex mol­ecules and lattice water mol­ecules, which are linked together by inter­molecular O—HO hydrogen bonds and partly overlapping π–π inter­actions between the pyridine and benzene rings [centroid–centroid distances = 3.922 (2) and 3.921 (2) Å]. One of the lattice water mol­ecules is disordered over two positions in an occupancy ratio of 0.521 (6):0.479 (6).

The title complex, [Sm₂(C₃H₅O₂)₆(C₁₂H₈N₂)₂], is a dinuclear centrosymmetric mol­ecule, in which two crystallographically equivalent Sm atoms, separated by 3.9502 (2) Å, are bridged by four propanoate anions. Each Sm atom is coordinated by two N atoms from one chelating phenanthroline ligand and seven carboxylate O atoms from five propanoate anions, to form a distorted tricapped trigonal prism.

In the title heteronuclear Ni^II–Ho^III complex (systematic name: {μ-6,6′-dieth­oxy-2,2′-[ethane-1,2-diylbis(nitrilo­methyl­idyne)]diphenolato-1κ⁴O¹,O^1′,O⁶,O^6′:2κ⁴O¹,N,N′,O^1′}trinitrato-1κ⁶O,O′-holmium(III)nickel(II)), [HoNi(C₂₀H₂₂N₂O₄)(NO₃)₃], with the hexa­dentate Schiff base compartmental ligand N,N′-bis­(3-ethoxy­salicyl­idene)ethyl­enediamine (H₂L), the Ho and Ni atoms are doubly bridged by two phenolate O atoms of the Schiff base ligand. The coordination of Ni is square-planar with the donor centers of two imine N atoms and two phenolate O atoms. The holmium(III) center has a tenfold ­coordination environment of O atoms, involving the phenolate O atoms, two eth­oxy O atoms and two O atoms each from the three nitrates. Weak C—HO and ONi [3.383 (4) Å] inter­actions generate a two-dimensional zigzag sheet.

In the title compound (common name: iodiconazole), C₁₉H₁₉F₂IN₄O, there is an intra­molecular O—HN hydrogen bond and mol­ecules are linked by weak inter­actions only, namely C—HN, C—HO and C—HF hydrogen bonds, and π-electron ring–π-electron ring inter­actions between the triazole rings with centroid–centroid distances of 3.725 (3) Å.

The title compound [systematic name: 5'a-hydroxy-1',3,6,8'-tetrakis(methylene)-3a,4,5,5',5'a,6,6',6a,7,7',7'a,8',9a,9b,10'a,10'b-hexadecahydrospiro[azuleno[4,5-b]furan-9(2H),3'-[3H]benz[1,8]azuleno[4,5-b]furan]-2,2',8,9'(1'H,3H,4'H)-tetrone acetone 0.92-solvate], C₃₀H₃₀O₇·0.92C₃H₆O, is a dimeric sequiterpene formed by a cyclohexane system connecting two monomeric sesquiterpene lactone units of dehydro­zaluzanin C. It was isolated from Ainsliaea henryi.

The title compound (systematic name: 5,7-dihydr­oxy-3,6,8-trimeth­oxy-4H-chromen-4-one), C₁₈H₁₆O₇, is a flavone that was isolated from Ainsliaea henryi. There are two mol­ecules in the asymmetric unit, one of which has a disordered meth­oxy group [occupancy ratio 0.681 (9):0.319 (9)]. Both mol­ecules have an intra­molecular O—HO hydrogen bond. In the crystal, mol­ecules are linked into O—HO hydrogen-bonded chains parallel to [110].

The title compound, C₃₁H₅₀O, a tetra­cyclic triterpene, was isolated from Ainsliaea henryi. The mol­ecule contains a three-membered ring, a five-membered ring, which exhibits an envelope conformation, and three six-membered rings, which adopt chair conformations.

The title compound (systematic name: 3-hy­droxy-1,2-dimeth­oxy-9H-xanthen-9-one), C₁₅H₁₂O₅, was isolated from Polygala arillata. The tricyclic unit is essentially planar (r.m.s. deviation = 0.039 Å). In the crystal, the mol­ecules form stacks along the a axis. Inter­molecular O—HO hydrogen bonds link the mol­ecules into chains parallel to [010].