{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,4]],"date-time":"2026-10-04T22:27:23Z","timestamp":1791152843498,"version":"4.1.0"},"reference-count":15,"publisher":"Wiley","issue":"6","license":[{"start":{"date-parts":[[2008,3,7]],"date-time":"2008-03-07T00:00:00Z","timestamp":1204848000000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Magnetic Reson in Chemistry"],"published-print":{"date-parts":[[2008,6]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:p>The complete assignments of all the <jats:sup>1<\/jats:sup>H and <jats:sup>13<\/jats:sup>C NMR signals of three polyhydroxylated 12\u2010ursen\u2010type triterpenes, 6\u03b2,19\u03b1,22\u03b1\u2010trihydroxyurs\u201012\u2010en\u20103\u2010oxo\u201028\u2010oic acid (1), 3\u03b2,6\u03b1,19\u03b1,23\u2010tetrahydroxyurs\u201012\u2010en\u201028\u2010 oic acid (2) and 3\u03b2,6\u03b2,19\u03b1,23\u2010tetrahydroxyurs\u201012\u2010en\u201028\u2010oic acid (3), were carried out by means of homo\u2010 and hetero\u2010nuclear two\u2010dimensional NMR experiments. Compounds 1\u20133 were isolated from the aerial parts of <jats:bold><jats:italic>Dischidia esquirolii<\/jats:italic><\/jats:bold>. Of them, 1 and 2 were identified as new polyhydroxylated ursolic acid derivatives. Compound 2 is the C\u20106 hydroxyl epimer of 3, which was isolated first from <jats:bold><jats:italic>Adina rubella<\/jats:italic><\/jats:bold>, and its structure is revised in this paper. Copyright \u00a9 2008 John Wiley &amp; Sons, Ltd.<\/jats:p>","DOI":"10.1002\/mrc.2212","type":"journal-article","created":{"date-parts":[[2008,3,7]],"date-time":"2008-03-07T07:46:38Z","timestamp":1204875998000},"page":"571-575","source":"Crossref","is-referenced-by-count":9,"title":["Complete assignments of <sup>1<\/sup>H and <sup>13<\/sup>C NMR spectral data for three polyhydroxylated 12\u2010ursen\u2010type triterpenoids from <b><i>Dischidia esquirolii<\/i><\/b>"],"prefix":"10.1002","volume":"46","author":[{"given":"Xiaoxia","family":"Ma","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Chongren","family":"Yang","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yingjun","family":"Zhang","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2008,3,7]]},"reference":[{"key":"e_1_2_1_2_2","doi-asserted-by":"publisher","DOI":"10.1016\/0031-9422(95)00428-A"},{"key":"e_1_2_1_3_2","doi-asserted-by":"publisher","DOI":"10.1021\/np50069a004"},{"key":"e_1_2_1_4_2","doi-asserted-by":"publisher","DOI":"10.1016\/0031-9422(91)83739-8"},{"key":"e_1_2_1_5_2","doi-asserted-by":"publisher","DOI":"10.1021\/np50064a002"},{"key":"e_1_2_1_6_2","doi-asserted-by":"publisher","DOI":"10.1002\/cbdv.200590072"},{"key":"e_1_2_1_7_2","doi-asserted-by":"publisher","DOI":"10.1021\/np960158q"},{"key":"e_1_2_1_8_2","doi-asserted-by":"publisher","DOI":"10.1016\/S0031-9422(00)80395-7"},{"key":"e_1_2_1_9_2","first-page":"468","volume":"17","author":"Zhang YJ","year":"1995","journal-title":"Acta Bot. 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