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AIM: To define the predictive factors of severe retinopathy of prematurity (ROP) and develop a nomogram for predicting severe ROP in southeast China. METHODS: Totally 554 infants diagnosed with ROP hospitalized in the Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University and hospitalized in Taizhou Women and Children's Hospital were included. Clinical data and 43 candidate predictive factors of ROP infants were collected retrospectively. Logistic regression model was used to identify predictive factors of severe ROP and to propose a nomogram for individual risk prediction, which was compared with WINROP model and Digirop-Birth model. RESULTS: Infants from the Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University (n=478) were randomly allocated into training (n=402) and internal validation group (n=76). Infants from Taizhou Women and Children's Hospital were set as external validation group (n=76). Severe ROP were found in 52 of 402 infants, 12 of 76 infants, and 7 of 76 infants in training group, internal validation group, and external validation group, respectively. Birth weight [odds ratio (OR), 0.997; 95% confidence interval (CI), 0.996-0.999; P

Garcinia xanthochymus has been widely used in traditional Chinese medicine for expelling worms and removing food toxins. Bioassay-guided fractionation of an EtOAc-soluble extract of G. xanthochymus stem bark led to the isolation of six new xanthones. Their structures were elucidated by spectroscopic methods, especially 2D-NMR techniques. Free-radical-scavenging activities of the isolated compounds were elucidated through DPPH method. Most of the isolated compounds showed considerable free radical scavenging activity on DPPH assay. Compound 1 exhibited effective antioxidant scavenging activity against DPPH radical with an IC50 value of 19.64 μM, and compound 6 showed the lowest activity among all the tested molecules, with an IC50 value of 66.88 μM. These findings support the notion that the plant genus Garcinia is a good source of bioactive compounds.

In the title compound, C26H23ClFN5O2S2, the mean plane of the guanidine fragment makes dihedral angles of 58.94 (13), 78.37 (17) and 50.76 (15)°, respectively, with the attached thiazole, pyridine and phenyl rings. The crystal structure features N—H...S and C—H...O hydrogen bonds and weak π–π stacking interactions [centroid–centroid separation = 3.7702 (17) Å]. The terminal methyl group of the ethoxycarbonyl group is disordered over two orientations in a 0.836 (10):0.164 (10) ratio.

In the title compound, C19H15FN4S2, the mean plane of the thiazolopyrimidine makes a dihedral angle of 77.6 (1)° with the attached phenyl ring. The crystal packing is stabilized by intermolecular C—H...N hydrogen bonds and weak C—H—π stacking interactions.

In the title compound, [Ir(C10H8N3)(C11H8N)2], the Ir center is octahedrally coordinated by the three chelating ligands, with two cyclometalated 2-pyridylphenyl ligands [Ir—N = 2.049 (5) and 2.030 (5) Å; Ir—C = 2.016 (6) and 2.012 (6) Å] and a bidentate 2-(phenyldiazenyl)pyrrolate ligand [Ir—N = 2.204 (5) and 2.079 (5) Å]. The Ir—N(diazenyl) bond is longer than the Ir—N(pyrrolate) bond. The structure is stabilized by aromatic π–π stacking, the shortest parallel distance between ring centroids being 3.426 (8) Å..

In the crystal structure of the title compound, C14H14F3O7P, the central chain, which connects the phosphate bicyclic system and the benzene ring, is made up of an approximately planar C—C(O)—O—C(H2) fragment and a C(H2)—O—C(Ph) link; the mean planes make a dihedral angle of 75.9 (2)°. The F atoms are disordered over two positions; the site occupancy factors are ca 0.6 and 0.4.

In the molecule of the title compound, C17H15BrO3, the rings make a dihedral angle of 75.54 (17)°. In the crystal structure, intermolecular C—H...O hydrogen bonds link the molecules into centrosymmetric dimers, and the π-stacked dimers interact with neighbouring dimers via C—H...π stacking interactions.

In the title molecule, C21H25NO2, the dihedral angle between the two benzene rings is 4.8 (2)°. Both the ethyl group of the ester group and one of the ethyl groups attached to the N atom are disordered over two sites, the approximate occupancies being 66:34 and 81:19, respectively. In the cystal structure, there are no direction-specific interactions.