Epigomisin O

J Nat Prod. 2006 Dec;69(12):1697-701.

Rubrisandrins A and B, lignans and related anti-HIV compounds from Schisandra rubriflora.[Pubmed: 17190445 ]

METHODS AND RESULTS:
Bioactivity-directed fractionation of an ethanolic extract of the fruits of Schisandra rubriflora led to the isolation and identification of dibenzocyclooctadiene lignans including the new lignans rubrisandrins A (1a + 1b) and B (2) and the known lignans gomisin J (3), (+/-)-gomisin M1 (4), (+)-gomisin M2 (5), schisanhenol (6), deoxyschisandrin, schisantherin B, schisandrin, tigloylgomisin P, gomisin O, angeloylgomisin P, and Epigomisin O. Their structure and stereochemistry were determined by spectroscopic methods, including 2D-NMR techniques.
CONCLUSIONS:
Compounds 1 and 3-6 were active as anti-HIV agents. (+/-)-Gomisin M1 (4) exhibited the most potent anti-HIV activity, with EC50 and therapeutic index (TI) values of <0.65 microM and >68, respectively.

Chem Pharm Bull (Tokyo). 2007 Aug;55(8):1281-3.

Lignans from Schisandra propinqua var. propinqua.[Pubmed: 17666862]

METHODS AND RESULTS:
Two new dibenzocyclooctadiene lignans angeloyl-(+)-gomisin K(3) (1) and methylisogomisin O (2), together with six known ones, isogomisin O, angeloylisogomisin O, gomisin O, angeloygomisin O, benzoylgomisin O, Epigomisin O, and four 1,4-bis(phenyl)-2,3-dimethylbutane type lignans, pregomisin, meso-dihydroguaiaretic acid, isoanwulignan, and sphenanlignan were isolated from the aerial parts of Schisandra propinqua var. propinqua.
CONCLUSIONS:
The structures of 1 and 2 were elucidated by spectroscopic methods including extensive 1D- and 2D-NMR techniques.