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Four new tetrahydrofuran lignans, schpropinrins A-D ( 1–4 ), together with five known ones, were isolated from the leaves and stems of  Schisandra propinqua  var.  sinensis . Their structures, including absolute configurations, were characterized by means of spectroscopic analysis and ECD calculation. Compounds  1–4  featured a ketal or hemiketal substructure at C-7 and all of the isolates were tested for their anti-HIV integrase activity.Electronic Supplementary Material  Supplementary material is available for this article at 10.1007/s13659-013-0017-8 and is accessible for authorized users.

Four new lignans from the leaves and stems of Schisandra propinqua var. sinensis