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Three new iridoids, namely neonanin A ( 1 ), neonanin B ( 2 ) and neoretinin A ( 3 ), as well as twelve known compounds, 6-hydroxy-7-methyl-1-oxo-4-carbomethoxyoctahydrocyclopenta[ c ]pyran ( 4 ), 4- epi -alyxialactone ( 5 ), loganetin ( 6 ), loganin ( 7 ), phenylcoumaran-α'-aldehyde ( 8 ), cleomiscosin A ( 9 ), ficusal ( 10 ), balanophonin ( 11 ), vanillic acid ( 12 ), p -coumaric acid ( 13 ), cis,trans -abscisic acid ( 14 ), and trans,trans -abscisic acid ( 15 ) were isolated from the stems of Neonauclea reticulata (Havil.) Merr. These new structures were determined by the detailed analysis of spectroscopic data and comparison with the data of known analogues. Compounds 1⁻13 were evaluated using an in-vitro MTT cytotoxic assay for hepatocellular carcinoma (HCC) cells, and the preliminary results showed that ficusal (10), balanophonin (11), and p -coumaric acid (13) exhibited moderate cytotoxic activity, with EC 50 values of 85.36 ± 4.36, 92.63 ± 1.41, and 29.18 ± 3.48 µg/mL against Hep3B cells, respectively.

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Three New Iridoid Derivatives Have Been Isolated from the Stems of Neonauclea reticulata (Havil.) Merr. with Cytotoxic Activity on Hepatocellular Carcinoma Cells