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The molecule of the title compound, C9H7NO, is nearly planar, with an r.m.s. deviation of 0.018 (7) Å. In the crystal structure, two molecules form an R²2(8) centrosymmetric dimer through N H⋯O hydrogen bonds. The three-dimensional packing is additionally stabilized through weak C—H⋯O interactions. [ABSTRACT FROM AUTHOR]

In the crystal structure of the title compound [systematic name: 3-amino-1,3-diazaspiro[4.5]decane-2,4-dione-phenylboronic acid (1/1)], C8H13N3O2·C6H7BO2, molecules are held together by O—H…O, N—H…O and C—H…O hydrogen bonds and by an N—H…π interaction. [ABSTRACT FROM AUTHOR]

The title compound, C26H26N2O3, crystallizes as a racemic mixture of R, R and S, S enantiomers. The two independent mol­ecules show a similar conformation. They are connected via C—H⋯O and C—H⋯π inter­actions to form ribbons along the a axis. [ABSTRACT FROM AUTHOR]

The molecule of the title compound, C5H14NO4P, exists as a zwitterion rather than as [1-(hydroxyethyl­amino)propyl]­phospho­nic acid, with the N atom of the amino group protonated and the phospho­nic acid group negatively charged. In the crystal structure, the molecules are linked via extensive hydrogen bonding, forming layers parallel to (100). [ABSTRACT FROM AUTHOR]

The asymmetric unit of the title compound, C9H12N+·C4H4O−, contains two independent 1,2,3,4-tetrahydroisoquinolinium cations and two independent hydrogensquarate anions. In one of the cations, the N atom is disordered over two positions with occupancies of approximately 0.8 and 0.2. The pyridinium rings adopt envelope conformations. The hydrogensquarate anions are linked to form cyclic tetramers through strong O—H...O hydrogen bonds. The tetrahydroisoquinolinium and hydrogensquarate ions are linked via N—H...O hydrogen bonds, forming a three-dimensional framework. [ABSTRACT FROM AUTHOR]

In the title compound, C11H10N+·C4H5O6−·2H2O, hydrogen tartrate anions and water molecules are linked by strong O—H...O hydrogen bonds to form corrugated layers. The 4-phenylpyridinium cation decorates the layer from both sides, being hydrogen bonded to the water molecule only. The three-dimensional packing of the complex layers is accomplished by strong π–π interactions of 3.668 (2) Å between the centroids of the benzyl and pyridine rings related by the symmetry operator ( x −  , − y +  , − z). [ABSTRACT FROM AUTHOR]

The article presents information on the structure of codeinone. Codeinone has been found to possess antitumor potential, with high cytotoxic activity against human promyelocytic leukaemic cell lines and is known that codeinone in the living cell is produced from the reaction of codeine with nicotinamide adenine dinucleotide phosphate. The molecular structure exhibits features typical for morphine derivatives, with a T-shaped configuration. The crystal packing was found to be stabilized by weak intermolecular C-H&3x22EF;O interactions.

The title compound (systematic name: 6α-acet­oxy-4,5α-ep­oxy-3-meth­oxy-17-meth­yl-morphin-7-ene), C20H23NO4, crystallizes with one mol­ecule in the asymmetric unit. The mol­ecular structure exhibits features typical of morphine derivatives with a T configuration. The three-dimensional packing is stabilized by inter­molecular C—H⋯N and C—H⋯π inter­actions. [ABSTRACT FROM AUTHOR]

The mol­ecule of the title compound, C21H22N2O2, is nearly planar, except for the C(CH3)2 group on the cyclo­hexene ring. Molecules are connected via electrostatic C⋯O contacts, forming zigzag pseudo-chains along the c axis. [ABSTRACT FROM AUTHOR]

In the title compound, 3,4-dioxo-2-(pyridinium-1-yl)cyclobut-1-enolate, C9H5NO3, molecules are connected three-dimensionally through nonclassical C—H...O and π–π interactions [3.220 (3) Å] between the oppositely charged squarate and pyridinium fragments. Classical hydrogen-bonding interactions are not observed. In the unit cell, only half an independent molecule is present and a twofold rotation axis passes through the pyridinium ring and the opposite CO group. [ABSTRACT FROM AUTHOR]

In the title compound, sodium 2-hydr­oxy-3,4-dioxocyclo­but-1-en-1-olate monohydrate, Na+·C4HO4−·H2O, the Na atom is six-coordinated by the O atoms from four hydrogensquarate anions and two water mol­ecules. The three-dimensional packing is stabilized by a system of hydrogen bonds. [ABSTRACT FROM AUTHOR]