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Compounds\n                    <jats:bold>1<\/jats:bold>\n                    \u2013\n                    <jats:bold>5<\/jats:bold>\n                    were identified by combined spectroscopic and spectrometric techniques, including 1D\/2D NMR, HRESIMS, and ECD. Antioxidant assays revealed that compounds\n                    <jats:bold>2<\/jats:bold>\n                    ,\n                    <jats:bold>5<\/jats:bold>\n                    , and\n                    <jats:bold>6<\/jats:bold>\n                    exhibited DPPH (IC\n                    <jats:sub>50<\/jats:sub>\n                    : 36.58\u201353.90 \u00b5M) and ABTS (IC\n                    <jats:sub>50<\/jats:sub>\n                    : 25.96\u201345.80 \u00b5M) free radical scavenging activity, whereas compound\n                    <jats:bold>1<\/jats:bold>\n                    was appreciably active in the ABTS assay (IC\n                    <jats:sub>50<\/jats:sub>\n                    = 58.47 \u00b5M). Notably, compound\n                    <jats:bold>6<\/jats:bold>\n                    was the most potent antioxidant, showing greater activity than the positive control Trolox in both assays (DPPH: IC\n                    <jats:sub>50<\/jats:sub>\n                    = 36.58\u00a0vs. 41.12 \u00b5M; ABTS: IC\n                    <jats:sub>50<\/jats:sub>\n                    = 25.96\u00a0vs. 29.09 \u00b5M). These findings have enriched the chemical diversity of iridoids from VMML and provided preliminary evidence for their free radical scavenging activity.\n                  <\/jats:p>","DOI":"10.1002\/cbdv.71649","type":"journal-article","created":{"date-parts":[[2026,9,3]],"date-time":"2026-09-03T09:33:06Z","timestamp":1788427986000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Five New Iridoids From the Leaves of\n                    <i>Viburnum macrocephalum<\/i>\n                    f\n                    <i>. macrocephalum<\/i>\n                    and Their Free Radical Scavenging Activity"],"prefix":"10.1002","volume":"23","author":[{"given":"Ya\u2010Jiao","family":"Chen","sequence":"first","affiliation":[{"name":"College of Bioscience and Biotechnology Yangzhou University  Yangzhou China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hong\u2010Juan","family":"Zhou","sequence":"additional","affiliation":[{"name":"College of Bioscience and Biotechnology Yangzhou University  Yangzhou China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jia","family":"Chen","sequence":"additional","affiliation":[{"name":"College of Bioscience and Biotechnology Yangzhou University  Yangzhou China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jian\u2010Hua","family":"Shao","sequence":"additional","affiliation":[{"name":"College of Bioscience and Biotechnology Yangzhou University  Yangzhou China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7941-8175","authenticated-orcid":false,"given":"Chun\u2010Chao","family":"Zhao","sequence":"additional","affiliation":[{"name":"College of Bioscience and Biotechnology Yangzhou University  Yangzhou China"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2026,9,3]]},"reference":[{"key":"e_1_2_9_2_1","first-page":"317","article-title":"Iridoid\u2014A Promising Potential Secondary Products","volume":"2","author":"Zhou R. 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