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Abstract
One new sesquiterpene, (1α,4aβ,8aα)-1-isopropanol-4a-methyl-8-methylenedecahydronaphthalene (1), with one new phenylpropanoid, threo-2-(4-hydroxy-3,5-dimethoxyphenyl)-3-(4-hydroxy-3-methoxyphenyl)-3-ethoxypropan-1-ol (2), along with four known phenylpropanoids were isolated from Crataegus pinnatifida. The structures of compounds 1 and 2 were elucidated on the basis of 1D, 2D NMR analyses, and HR-ESI-MS. The antithrombotic activity in vitro of all isolates was assayed, and only compound 1 exhibited potent antithrombotic activity by inhibiting platelet aggregation in rat plasma by 81.4% at 1 mg/ml.
Acknowledgments
This work was financially supported by the National Natural Youth Science Foundation of China (No. 81302661), the Scientific Research Starting Foundation for Doctors (No. 20121106) and the Foundation from the Project of Education Department of Liaoning Province of China (No. L2012358). The authors thank Senior Engineer W. Li and Senior Engineer Y. Sha of Shenyang Pharmaceutical University for supporting the recording of NMR spectra.