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5 citations found for Sousa, M.
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In order to study structure-activity relationships, a series of mono-, di- and trioxygenated xanthones has been synthesized and the structures of methyl 2-(3,4-dimethoxyphenoxy)benzoate, C16H16O5, 2-(3,4-dimethoxyphenoxy)benzoic acid, C15H14O5, 1,2-dimethoxy-9H-xanthen-9-one, C15H12O4, and 1,2,8-trimethoxy-9H-xanthen-9-one, C16H14O5, have been determined. The first two compounds both assume skew conformations, the dihedral angles between the two phenyl rings being 80.04 (8) and 83.0 (1)°, respectively. The latter two compounds are essentially planar and their methoxy substituents assume orientations consistent with minimum steric interactions.
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The xanthone skeleton of the title compound, C13H8O4·3H2O, exhibits a planar conformation, with the hydroxy H atoms lying in the plane. In the crystal structure, the molecules are packed into columns with their planar skeletons parallel to one another.
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The first structure of a superoxide reductase from a eukaryotic organism, G. intestinalis, is described at 2.0 Å resolution. The data suggest a lack of redox-linked structural changes upon iron-centre reduction, high flexibility in the N-terminal loop of the protein and high sensitivity of the crystallized protein to radiation damage.
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Anomalous scattering measurements reveal a K+ ion bound in proximity to the active site of the H. influenzae HslV protease.
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In the title compound, C19H10ClNO4, the dihedral angle between the naphthoquinone and coumarin rings is 48.99 (6)°. In the crystal, molecules are linked by strong N—H
O hydrogen bonds into chains with graph-set motif C(6) along [101]. The packing also features π–π stacking interactions between naphthoquinone and coumarin rings [centroid-to-centroid distances = 3.7679 (12) and 3.6180 (13) Å].
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