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Two new diterpenoids, dauricumins A ( 1 ) and B ( 2 ), together with two known aromatic meroterpenoids ( 3  and  4 ), were isolated from the petroleum ether soluble fraction of the stems from  Rhododendron dauricum  through an HPLC-MS-SPE-NMR combination strategy. The absolute configurations of  1  and  2  were elucidated by ECD calculations and [Rh 2  (OCOCF 3 ) 4 ]-induced CD spectrum analysis. In a membrane potential FLIPR assay, confluentin ( 4 ) showed an agonistic effect on GABA A  receptor (EC 50  = 20 µM).

Two new diterpenoids from the stems of Rhododendron dauricum as GABA A receptor agonists