In the title compound, [Cu(SO₄)(C₁₂H₈N₂)(H₂O)₃]·H₂O, the Cu^II centre exhibits a slightly distorted cis-CuN₂O₄ octa­hedral coordination defined by two N atoms from a 1,10-phenanthroline mol­ecule, one O atom from a sulfato dianion and three O atoms from coordinated water mol­ecules.

The mol­ecule of the title compound, C₇H₇NO₃, is nearly planar [maximum deviation 0.112 (3) Å for one of the notro O atoms]. In the crystal structure, inter­molecular O—HO and C—HO inter­actions link the mol­ecules into a three-dimensional network.

In the title 1:1:1 adduct, C₁₀H₈N₂·C₁₀H₁₀O₆·H₂O, the dihedral angle between the rings of the 4,4-bipyridine molecule is 10.981 (8)°. In the crystal, O—HO and O—HN hydrogen bonds link the mol­ecules into a zigzag chain structure.

In the title complex, [Cu(NO₃)₂(C₁₁H₁₁N₃O)₄], the Cu^II atom is situated on a centre of inversion and is coordinated by two O atoms from two nitrate anions and four N atoms from four monodentate 1-phenyl-3-(1H-1,2,4-triazol-1-yl)propan-1-one ligands in a distorted octa­hedral geometry. Weak inter­molecular C—HO and C—HN hydrogen bonds result in a supra­molecular layer parallel to (101). These layers are connected by π–π inter­actions between the benzene rings [centroid–centroid distance = 3.891 (2) Å].

In the title mol­ecule, C₁₀H₈ClN₃O₂, the dihedral angle between the pyridine and pyrazole rings is 64.01 (8)°. In the crystal structure, inter­molecular O—HN hydrogen bonds link mol­ecules, forming extended chains along [001]. These chains are, in turn, linked by weak inter­molecular C—HO inter­actions, forming a two-dimensional network perpendicular to the b axis.

In the title compound, C₁₃H₁₀ClN₃, the benzimidazole and chloropyridyl groups are planar and make a dihedral angle of 68.01 (18)°. There are two weak C—HN hydrogen bonds, producing sheets parallel to (100).

Crystals of the title compound [systematic name: (3R,6R,7S,8aR,9R,12aR)-7-hydr­oxy-3,6,9-trimethyl­octa­hydro-3,12-ep­oxy[1,2]dioxepino[4,3-i]isochromen-10(3H)-one], C₁₅H₂₂O₆, were obtained from microbial transformation of artemisinin by a culture of Cunninghamella elegans. The stereochemistry of the compound is consistent with the spectroscopic findings in previously published works. A weak O—HO hydrogen bond occurs in the crystal structure, together with intermolecular C—HO hydrogen bonds.

The title compound contains layers built up from isolated BO₃ triangles and MgO₆ octa­hedra, inter­leaved with SrO₉ polyhedra to form a three-dimensional framework. The Sr atom is nine-coordinate in a distorted tricapped trigonal prismatic geometry. Sr, B and one O atom have m point symmetry and Mg 2/m point symmetry.

The title compound, C₂₂H₂₀F₂O₃, a derivative of curcumin, crystallized with two independent mol­ecules in the asymmetric unit. The mean planes of the two 2-fluoro-5-meth­oxy­phenyl groups are aligned at 24.88 (11)° in one mol­ecule and 24.19 (15)° in the other. The dihedral angles between the mean plane of the penta-1,4-dien-3-one group and those of the two 2-fluoro-5-meth­oxy­phenyl rings are 51.16 (11) and 49.16 (10)° in the first mol­ecule, and 45.69 (15) and 54.00 (14)° in the second. The mol­ecules adopt E configurations about the central olefinic bonds.

The title compound, C₁₀H₇FO₄, is an inter­mediate in the synthesis of the drug Fidarestat, (2S,4S)-2-aminoformyl-6-fluoro-spiro[chroman-4,4′-imidazolidine]-2′,5′-dione. The di­hydro­pyran­one ring adopts an envelope conformation with the asymmetric C atom in the flap position. In the crystal, the mol­ecules are linked into zigzag chains along [100] by O—HO hydrogen bonds and C—Hπ inter­actions involving the benzene ring.

In the title compound, C₁₆H₂₂O₂, the cyclo­hexane ring adopts a chair conformation and its mean plane subtends a dihedral angle of 54.2 (6)° with the benzene ring. The crystal structure is stabilized by van der Waals inter­actions only with no classical inter­molecular hydrogen bonding observed.