Two new carbon skeleton compounds, identified as 2-(1-(3-hydroxy-2,2,6-trimethyl-6-vinyltetrahydro-2-pyran-3-yl)-2-methylpropoxy)-6-(hydroxymethyl)tetrahydro-2-pyran-3,4,5-triol named Olerapyran A (), and (E)-3-(6-acetyl-2-methyl-5-((3,4,5-trihydroxy-6-(hydroxymethyl)tetrahydro-2-pyran-2-yl)oxy)cyclooctylidene)butan-2-one named Oleraoctyl (), were first isolated from L., then their structures were determined using spectroscopic methods, including UHPLC-ESI-QTOF/MS, 1D and 2D NMR. In addition, the activities of Olerapyran A and Oleraoctyl inhibiting nitric oxide (NO) were studied.
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