Publications by authors named "Sung-Kwon Kang"

Air pollution, allergens, and bacterial infections are major contributors to pathological respiratory disorders worldwide. CKD-497, derived from the rhizome of and the fruits of , is known for its ability to relieve cough and facilitate phlegm expectoration. However, its protective action against allergic asthma and fine dust-induced lung inflammation, along with its underlying mechanisms, have not been thoroughly investigated.

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  • Duodenal mucosal resurfacing (DMR) is an innovative, minimally invasive procedure to manage metabolic syndrome, but traditional thermal ablation can lead to complications like deep mucosal injury.
  • Researchers have developed a non-thermal alternative using photodynamic therapy (PDT) with a specially designed metal stent to reduce the risks associated with thermal procedures while still effectively treating metabolic syndrome.
  • An animal study demonstrated that this new PDT approach, involving controlled release of reactive oxygen species, was safe and effective, showing no significant adverse effects while also decreasing the secretion of gastric inhibitory polypeptide (GIP), important in metabolic syndrome management.
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Objective: Tofacitinib is an oral Janus kinase (JAK) inhibitor marketed as an immunomodulator that can effectively treat rheumatoid arthritis. This study aimed to compare the pharmacokinetics and evaluate the bioequivalence of tofacitinib free base (CKD-374) with those of tofacitinib citrate (Xeljanz).

Materials And Methods: A randomized, open-label, single-dose, 2-sequence, 2-period crossover study was conducted in healthy Korean male subjects.

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Central airway obstruction (CAO) can be attributed to several benign or malignant conditions. Although surgery is the preferred therapeutic option for the management of CAO, bronchoscopic treatment can be performed in scenarios where the surgical procedure is not possible. Recent years have witnessed several improvements in the field of bronchoscopic treatment, especially with regard to airway stents.

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In this study, the anti-adipogenic activities of compounds isolated from Solidago viraurea var. gigantea (SG) extracts were investigated using Oil Red O staining in the 3T3-L1 cell line. Four known compounds including 3,5-di-O-caffeoylquinic acid (5), protocatechuic acid (6), chlorogenic acid (7), and kaempferol-3-O-rutinoside (8), and four undescribed compounds including (1R,2S,3S,5R,7S)-methyl 7-((cinnamoyloxy)methyl)-2,3-dihydroxy-6,8-dioxabicyclo[3.

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  • The compound [Cd(NO)(CHN)] features a cadmium (Cd) atom coordinated with four nitrogen (N) and two oxygen (O) atoms, resulting in a distorted octahedral structure.
  • The geometry involves two bidentate 2-(1-benzimidazol-2-yl)aniline ligands, with a dihedral angle of 30.43° between the aniline and benzimidazole rings.
  • Stability in the complex is provided by intra- and inter-molecular hydrogen bonds, contributing to a three-dimensional network in the crystal structure.
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The title compound, CHN, was obtained during a search for new π-extended ligands with the potential to generate efficient phosphors with iridium(III) for organic light-emitting devices (OLEDs). The benzoquinoxaline ring system is almost planar (r.m.

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In the title compound, [Cu(CHNO)(CHN)(HO)]·2HO, the Cu atom is coordinated by three O atoms and two N atoms, provided by a tridentate pyridine-2,6-di-carboxyl-ate (pdc), one pyrazole and one water ligand, forming a slightly distorted square-pyramidal geometry [range of O-Cu-O and O-Cu-N bond angles = 79.55 (8)-166.22 (10)°].

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A practical and sustainable method for the synthesis of levocabastine hydrochloride (), a H₁ receptor antagonist for the treatment of allergic conjunctivitis, that can be applied to the industrial production of the compound has been developed. Substantial improvements over the previously reported procedure are achieved via efficient preparation of an optically active key intermediate () without chiral resolution and with a more effective detosylation, which complements the previous procedure. Notably, our process requires no chromatographic purification and provides levocabastine hydrochloride in greater than 99.

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The title compound, CHNOP, was obtained during a search for new P,N-containing ligands with the potential to generate precatalysts with chromium(III) for selective ethyl-ene oligomerization. In the crystal, mutual pairs of N-H⋯O=P hydrogen bonds link two mol-ecules into a dimer with individual mol-ecules related by a twofold rotation axis. The P=O bond length of 1.

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Context: Ostericum koreanum (Maxim.) Kitagawa (Apiaceae) roots are traditionally used as an analgesic and antiulcer agent. However, the antiulcer potential of isoimperatorin isolated from O.

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In the title compound, C19H19NO5, the amide carbonyl O atom is positioned anti to the other two carbonyl O atoms. The 4-hy-droxy-hydro-cinnamate fragment is disordered over two positions with an occupancy ratio of 0.729 (12):0.

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Substituted benzoic acid and cinnamic acid esters are of interest as tyrosinase inhibitors and the development of such inhibitors may help in diminishing many dermatological disorders. The tyrosinase enzyme has also been linked to Parkinson's disease. In view of hydroxylated compounds having ester and amide functionalities to potentially inhibit tyrosinase, we herein report the synthesis and crystal structures of two amide-based derivatives, namely N-(4-acetylphenyl)-2-chloroacetamide, C10H10ClNO2, (I), and 2-(4-acetylanilino)-2-oxoethyl cinnamate, C19H17NO4, (II).

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  • A series of ten triazole Schiff base derivatives (6a-j) were synthesized using microwave-assisted methods, combining substituted amino triazole with various aldehydes.
  • Two compounds, 6a and 6b, demonstrated strong tyrosinase inhibitory activity, outperforming the reference inhibitor kojic acid in their IC50 values.
  • Kinetic studies revealed that the most effective inhibitors, 6a and 6b, acted as non-competitive inhibitors of tyrosinase, with inhibition constants of 0.023 and 0.022 mM, respectively.
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  • Metal complexes with Schiff base ligands are being explored as potential phosphors for electroluminescent devices.
  • The specific complex discussed features three zinc (Zn) cations, which show both six- and four-coordinate geometries due to the tetradentate Schiff base ligands.
  • This complex produces a strong emission at 469 nm with a quantum yield of 15.5%, indicating its effectiveness as a phosphor.
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In the title complex, [Cu(C13H8NOS)2], the Cu(II) atom is coordinated by two N atoms and two O atoms from two bidentate benzo-thia-zolphenolate ligands, forming a distorted tetra-hedral geometry [dihedral angle between two N-Cu-O planes: 45.1 (2)°]. The dihedral angles between the benzo-thia-zole ring systems and the phenol rings are 4.

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In the cation of the title salt, [Ag(C13H11N3)2]NO3, the Ag(I) atom lies on a crystallographic inversion center and is coordinated by four N atoms from two bidentate 2-(1H-benzimidazol-2-yl)aniline ligands in a distorted square-planar geometry. The Ag-N(aniline) bond [2.729 (2) Å] is significantly longer than the Ag-N(imidazole) bond [2.

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  • The compound C12H11N5 was developed as a possible tridentate ligand for creating metal complexes used in catalysis.
  • It features a dihedral angle of 67.9° between the pyrazolyl rings, indicating its structural configuration.
  • In the crystal structure, C-H⋯N hydrogen bonding interactions connect the molecules, forming a supra-molecular tape along the b-axis.
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In the title compound, C8H10O3, the hy-droxy-methyl group is twisted by 74.51 (13)° from the plane of the benzene ring to which it is connected. By contrast, the benzene and meth-oxy groups are almost coplanar, making a dihedral angle of 4.

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The cation of the complex title salt, [Zn(C13H11N3)2(H2O)](NO3)2, lies about a twofold rotation axis, which passes through the Zn(II) atom and the O atom of the aqua ligand. The Zn(II) atom adopts a distorted trigonal-bipyramidal geometry defined by two N atoms in axial positions [angle = 166.24 (7)°], and two N and one O atom in the equatorial plane [range of angles: 115.

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In the title complex, {[Ag(C13H13N5)]NO3} n , the Ag(I) atom is coordinated by three N atoms from two bidentate/monodentate pyrazolylpyridyl ligands to form a distorted trigonal-planar geometry [range of angles: 83.34 (6) (chelate ring) to 139.15 (7) °].

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In the title complex, [CoCl2(C25H21N5)], the Co(II) atom is coordinated by two Cl atoms and two N atoms, provided by a tridentate pyrazolylpyridyl ligand, forming a slightly distorted tetra-hedral geometry [range of angles: 96.51 (10) (chelate ring) to 118.60 (9)°].

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  • A set of new chromium(III) complexes using a specific tridentate ligand were developed and characterized for their ability to catalyze ethylene polymerization/oligomerization.
  • X-ray analyses confirmed that these complexes featured a specific geometric arrangement around the chromium center, crucial for their catalytic activity.
  • The effectiveness of these catalysts varied significantly based on the chemical groups attached to the ligands and the conditions under which the reactions were conducted.
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The asymmetric unit of the title compound, C28H26O6, contains one half-mol-ecule, with the complete molecule generated by a crystallographic inversion center. The central terephthalate and meth-oxy-benzene rings are approximately perpendicular, making a dihedral angle of 80.31 (5)°.

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In the title compound, C13H13N5, the planes of the pyrazolyl groups are nearly perpendicular to that of the central pyridine ring, making dihedral angles of 87.77 (8) and 85.73 (7)°.

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