{"@context":{"@vocab":"https://cir.nii.ac.jp/schema/1.0/","rdfs":"http://www.w3.org/2000/01/rdf-schema#","dc":"http://purl.org/dc/elements/1.1/","dcterms":"http://purl.org/dc/terms/","foaf":"http://xmlns.com/foaf/0.1/","prism":"http://prismstandard.org/namespaces/basic/2.0/","cinii":"http://ci.nii.ac.jp/ns/1.0/","datacite":"https://schema.datacite.org/meta/kernel-4/","ndl":"http://ndl.go.jp/dcndl/terms/","jpcoar":"https://github.com/JPCOAR/schema/blob/master/2.0/"},"@id":"https://cir.nii.ac.jp/crid/1360285708106900480.json","@type":"Article","productIdentifier":[{"identifier":{"@type":"DOI","@value":"10.1021/acs.jnatprod.8b00541"}},{"identifier":{"@type":"URI","@value":"https://pubs.acs.org/doi/pdf/10.1021/acs.jnatprod.8b00541"}},{"identifier":{"@type":"PMID","@value":"32227936"}}],"resourceType":"学術雑誌論文(journal article)","dc:title":[{"@value":"Propolis Components from Stingless Bees Collected on South Sulawesi, Indonesia, and Their Xanthine Oxidase Inhibitory Activity"}],"description":[{"notation":[{"@value":"Three new compounds, namely, 4-(4'-hydroxy-3'-methoxyphenyl)-3,5,7-trihydroxycoumarin (1) and sulawesins A (2) and B (3), were isolated from the propolis of stingless bees ( Tetragonula aff. biroi) collected on South Sulawesi, Indonesia. In addition, five known compounds, glyasperin A, broussoflavonol F, (2 S)-5,7-dihydroxy-4'-methoxy-8-prenylflavanone, (1' S)-2- trans,4- trans-abscisic acid, and (1' S)-2- cis,4- trans-abscisic acid, were identified. The structures of the new compounds were determined by a combination of methods that included mass spectrometry and NMR spectroscopy. The absolute configuration of sulawesin A (2), a new podophyllotoxin derivative, was determined by X-ray crystallography. The absolute configuration of sulawesin B (3) was also determined by the ECD calculation. 4-(4'-Hydroxy-3'-methoxyphenyl)-3,5,7-trihydroxycoumarin (1) and sulawesin A (2) were examined for xanthine oxidase (XO) inhibitory activity; 1 exhibited XO inhibitory activity, with an IC"}]}],"creator":[{"@id":"https://cir.nii.ac.jp/crid/1380285708106900482","@type":"Researcher","foaf:name":[{"@value":"Ryo Miyata"}],"jpcoar:affiliationName":[{"@value":"Graduate School of Integrated Pharmaceutical and Nutritional Sciences, University of Shizuoka, 52-1 Yada, Suruga-ku, Shizuoka 422-8526, Japan"}]},{"@id":"https://cir.nii.ac.jp/crid/1380285708106900480","@type":"Researcher","foaf:name":[{"@value":"Muhamad Sahlan"}],"jpcoar:affiliationName":[{"@value":"Department of Chemical Engineering, Faculty of Engineering, Universitas Indonesia, Baru UI, Depok 16424, 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