• Natural Product Sciences
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• 제9권2호
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• pp.52-55
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• 2003

The aerial parts of Ephedra aphylla afforded two alkaloids belonging to two different classes. The first alkaloid, ephedradine C, belonging to the spermine alkaloid, a group characterized by its hypotensive effect. The other alkaloid, hordenine is a phenylalkylamine alkaloid isolated for the first time from Ephedra Species. The structures were elucidated by spectroscopic methods and the assignment of some carbons in ephedradine C was achieved based on 2 D-NMR experiments.

• 생약학회지
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• 제22권3호
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• pp.166-170
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• 1991

Four compounds were isolated from the leaves and stems of Lycopus lucidus and identified as $2{\alpha}-hydroxy$ ursolic acid, tormentic acid, ${\beta}-sitosterol$ glucoside and linarin by spectroscopic methods.

• 생약학회지
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• 제22권3호
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• pp.162-165
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• 1991

Four triterpenoids were isolated from the leaves and stems of Lycopus lucidus and identified as betulinic acid, oleanolic acid, 3-epimaslinic acid and euscapic acid by spectroscopic methods.

• Journal of the Korean Wood Science and Technology
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• 제29권3호
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• pp.99-103
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• 2001

Three flavan-3,4-diol derivatives were isolated from the heartwood of Robinia pseudoacacia and characterized by spectroscopic methods including $^1H$ and $^{13}C$ NMR and positive FAB-MS. The structures were identified as 4,4'-dimethoxy-, 4-ethoxy- and 4-ethoxy-4'-methoxy-2,3-trans-3,4-cis-(+)-leucorobinetinidin.

• 약학회지
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• 제54권3호
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• pp.164-167
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• 2010

Column chromatographic separation of the MeOH extract from the aerial parts of Hibiscus manihot led to the isolation of four compounds. Their structures were characterized to be hentriacontane (1), palmitic acid (2), daucosterol (3) and 3-dihydrocaffeonyl-5-p-coumaroylquinic acid (4) by spectroscopic methods. The compounds (1~4) were for the first time reported from this plant. The solvent fractions were tested for their antioxidant activities by free radical scavenging and superoxide dismutase (SOD).

• 천문학회보
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• 제41권1호
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• pp.78.2-78.2
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• 2016

There are many telluric absorption lines which are laid on the science spectrum in ground based spectroscopic observations. In especial, the IR region spectra are considerably contaminated by telluric lines. Therefore, many scientists have a difficulty in removing the telluric effect. We thus tried removing telluric lines with IGRINS data by two methods. One is using the standard stellar spectrum as telluric lines. The other adopt calculated synthetic telluric spectrum. Here we present the results of test for precise removing telluric lines on IGRINS spectra.

• 대한화학회지
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• 제55권6호
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• pp.974-977
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• 2011

Ethyl 1-aminotetrazole-5-carboxylate (1) has been utilized to construct a variety of novel tetrazolo [1,5-b]-1,2,5-oxadiazepine derivatives which repesent a relatively little explored group with interesting antibacterial activities. The synthesized compounds were elucidated using IR, $^1H$ NMR and mass spectroscopic methods, besides elemental analyses.

• Bulletin of the Korean Chemical Society
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• 제28권5호
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• pp.827-831
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• 2007

Bioassay-directed fractionation of Draba nemorosa led to the isolation of two new phenolic glycosides, 1-O- (sinapoyl)-glucitol (2) and 1,3-disinapoylgentiobiose (5) along with five known phenolic glycosides (1, 3, 4, 6, and 7). Their structures were characterized based on spectroscopic methods (2D NMR, HRTOFMS, IR, and UV). The isolated compounds showed antioxidant activities (IC50) in the range of 14-98 mM which were estimated by DPPH radical-scavenging assay.

• 약학회지
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• 제48권1호
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• pp.65-69
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• 2004

The chromatographic separation of MeOH extract of the aerial parts of Aster glehni (Compositae) led to the isolation of three sesquiterpenes, two sterols and four terpenes. Their structures were determined to be $\beta$-amyrin acetate (1), phytol (2), alismol (3), $\alpha$-tocopheryl quinone (4), $\alpha$-spinasterol (5), 10-O-methyl alismoxide (6), alismoxide (7), and 3-O-(6'-O-palmitoyl-$\beta$-D-glucosyl)-spinasta 7,22-diene (8) by physicochemical and spectroscopic methods . These compounds (1-8) were first isolated from the Aster glehni.

• 대한화학회지
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• 제57권6호
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• pp.721-725
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• 2013

Reaction between 2-pyridinecarboxylic acid (Hpic) and $K_3[Cr(O_2)_4]$ give complex $[Cr(pic)_3].H_2O$ (1) which is characterized by elemental analysis and spectroscopic methods (FT-IR, Raman) and X-ray crystallography. In the crystal structure of 1, chromium atom with coordinated by three nitrogen and three oxygen atoms has a distorted octahedral geometry. Also a water molecule is incorporated in crystal network. Each water molecule acts as hydrogen bond bridging and connects two adjacent complexes by two $O-H{\cdots}O$ hydrogen bonds.