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The acid-base interaction induces a contraction of the r(AF) covalent bond in the acid in most cases and a deshielding of the NMR signal of the F nucleus.Eight new diterpenoid acids, namely, talascortenes A-G (1-7) and 5α,9β-dihydroxyisocupressic acid (8), with four different carbon skeletons, were isolated and identified from the endozoic fungal strain Talaromyces scorteus AS-242 that was obtained from the inner fresh tissue of a deep sea Cerianthus sp. sea anemone. The structures of the new compounds were elucidated by detailed interpr
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