Two new neolignans, syripinnalignins A and B (1 and 2, resp.), were isolated from the 95% EtOH extract of the stem of Syringa pinnatifolia Hemsl. var. alashanensis. The structures of 1 and 2 were elucidated by spectroscopic methods, including UV, IR, HR‐ESI‐MS, and extensive 1D‐ and 2D‐NMR techniques.
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Wang et al. (2012) studied this question.
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