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Abstract
Four new compounds, including two ascochlorin-type meroterpenoids acremocholrins A (1) and B (2), one pyridone alkaloid acremopyridone A (7), and one cyclopentenone derivative acremoketene A (12), together with eight known compounds (3-6 and 8-11), were isolated and identified from the hadal trench-derived fungus Acremonium dichromosporum YP-213. Their structures were determined with a detailed spectroscopic analysis of NMR and MS data, NOE analysis, octant rule and quantum chemical calculations of ECD, and NMR (with DP4+ probability analysis). Among the compounds, 7 represent a novel scaffold derived from a pyridone alkaloid by cleavage of the C-16-C-17 bond following oxidation to give a ketone. Compounds 9, 11, and 12 showed potent in vivo anti-inflammatory activity in transgenic zebrafish, while compound 8 exhibited significant proangiogenic activity in transgenic zebrafish.
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