In the title compound, C(13)H(16)O(5), one of the three hy-droxy groups is involved in intra-molecular O-H⋯O hydrogen bonds. The other two hy-droxy groups contribute to the three-dimensional hydrogen-bonding network, which consolidates the crystal packing.

The heterocyclic ring in the title compound, C(10)H(7)F(3)O(3), has a half-boat conformation with the hy-droxy-bearing C atom lying 0.595 (3) Å out of the plane of the five remaining atoms (r.m.s. deviation = 0.022 Å) in the direction of the hy-droxy O atom. Linear supra-molecular chains along the a axis, sustained by O-H⋯O hydrogen bonds between the hy-droxy H and ketone O atoms, feature in th...

The title compound, C(14)H(12)O(4), is an asymmetric substitution product of benzophenone. Both hy-droxy groups are orientated towards the O atom of the keto group. Intra-molecular as well as inter-molecular O-H⋯O hydrogen bonds can be observed in the crystal structure, with the latter connecting the mol-ecules into chains along the crystallographic b axis. C-H⋯O contacts [C⋯O = 3.3297 (18) Å] ...

In the title compound, C(25)H(29)NO(6), each of the cyclo-hexenone rings adopts a half-chair conformation. The hy-droxy and carbonyl O atoms face each other and are oriented to allow for the formation of two intra-molecular O-H⋯O hydrogen bonds. In the crystal, weak C-H⋯O hydrogen bonds are formed between molecules, generating a two-dimensional supramolecular structure.

The title compound, C(27)H(29)N(3)O(2), adopts an E configuration with respect to the C=N bond. The molecular structure is stabilized by inter-molecular O-H⋯N inter-actions between a hy-droxy H atom and the N atom on the quinoline ring.

The seven-membered ring of the title compound, C(12)H(12)N(2)O(3), which is fused with the phenyl-ene ring, adopts a boat-shaped conformation (with the methine C atom as the prow and the phenyl-ene C atoms as the stern); the H atom on the methine linkage exists in an axial position. The five-membered ring that is fused with the seven-membered ring adopts an envelope conformation (with the C ato...

This study of the complete life-spans of eight naturally-ocurring teams hegan with the unexpected finding that several project groups, studied for another purpose, did not accomplish their work by progressing gradually through a universal series of stages, as traditional group development models would predict. Instead, teams progressed in a pattern of "punctuated equilibrium," through alternati...

In the title mol-ecule, C(11)H(14)N(2)O(3), an intra-molecular O-H⋯O hydrogen bond closes an almost planar [maximum deviation = 0.022 (13) Å] six-membered ring and enforces the cis conformation of the keto group with respect to the hy-droxy substituent. In the crystal, inter-molecular N-H⋯O hydrogen bonds link the moleclues into ribbons extended along [10]. Weak inter-molecular C-H⋯O inter-acti...

In the title compound, C17H18N4O5·0.47CH3OH, the virtually planar (r.m.s. deviation = 0.128 Å) carbonohydrazide mol-ecule is located on a twofold axis and conformation of its C=N bonds is E. There are short intra-molecular O-H⋯N hydrogen bonds between the hy-droxy groups and hydrazide N atoms. In the crystal, bifurcated N-H⋯(O,O) hydrogen bonds assemble the carbonohydrazide mol-ecules into a th...

In the title compound, C(17)H(16)O(4), the dihedral angle between the mean planes of the hy-droxy-phenyl and dimeth-oxy-phenyl rings is 19.34 (7)°. The mean plane of the prop-2-en-1-one group, the active site in this mol-ecule, makes angles of 7.40 (8) and 13.25 (8)°, respectively, with the hy-droxy-phenyl and dimeth-oxy-phenyl rings. The crystal packing is stabilized by O-H⋯O hydrogen bonds, w...