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The structures of cajuputones A\u2013C were elucidated by 1D\/2D NMR spectroscopy and HR\u2010ESI\u2010MS analyses; and their absolute configurations were established by electric circular dichroism (ECD) calculations using TDDFT method. Structurally, cajuputones A\u2013C feature a rare 6\/6\/6\/6 oxatetracyclic ring system fused between an acylphloroglucinol\u2010derived <jats:italic>\u03b2<\/jats:italic>\u2010triketone and a pinocembrin or strobopinin moiety via an angle\u2010type pyran\u2010like motif. DFT\u2010based conformational optimization in chloroform explained the similarity of the 1D NMR data of cajuputones B and C (C\u20102 epimers).<\/jats:p>","DOI":"10.1002\/cbdv.202000706","type":"journal-article","created":{"date-parts":[[2020,10,7]],"date-time":"2020-10-07T15:23:02Z","timestamp":1602084182000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":4,"title":["Cajuputones A\u2013C, <i>\u03b2<\/i>\u2010Triketone Flavanone Hybrids from the Branches and Leaves of <i>Melaleuca cajuputi<\/i>"],"prefix":"10.1002","volume":"17","author":[{"given":"Wen\u2010Jun","family":"Xu","sequence":"first","affiliation":[{"name":"Jiangsu Key Laboratory of Bioactive Natural Product Research and State Key Laboratory of Natural Medicines School of Traditional Chinese Pharmacy China Pharmaceutical University  Nanjing 210009 P. R. 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