| In vitro: | | Chem Pharm Bull (Tokyo). 1993 Mar;41(3):487-90. |  | Palbinone, a novel terpenoid from Paeonia albiflora; potent inhibitory activity on 3 alpha-hydroxysteroid dehydrogenase.[Pubmed:  8477499] |  | METHODS AND RESULTS:
 Palbinone, a novel terpenoid isolated from the roots of Paeonia albiflora, showed a strong inhibitory activity on the reduced form of nicotinamide adenine dinucleotide phosphate (NADPH)-linked 3 alpha-hydroxysteroid dehydrogenase (3 alpha-HSD) of rat liver cytosol. The structures of palbinone and a known compound,
 CONCLUSIONS:
 Paeonilactone B isolated from the active fraction of this plant were determined by the use of 2D NMR techniques (1H-1H COSY, 1H-13C COSY, 1H-13C long-range COSY, and HMBC).
 |  | J Enzyme Inhib Med Chem. 2009 Oct;24(5):1138-40. |  | Chemical constituents isolated from Paeonia lactiflora roots and their neuroprotective activity against oxidative stress in vitro.[Pubmed: 19772486 ] |  | METHODS AND RESULTS:
 The methanolic extract of Paeonia lactiflora roots significantly protected primary cultures of rat cortical cells exposed to oxidative stress induced by H(2)O(2). Seven monoterpenes, Paeonilactone B (1), paeonilactone C (2), paeoniflorigenone (3), benzoylpaeoniflorin (4), paeoniflorin (5), oxypaeoniflorin (6) and albiflorin (7), were isolated by bioactivity-guided fractionation and further separation using chromatographic techniques.
 CONCLUSIONS:
 Among them, compounds 2 and 4 significantly protected primary cultures of rat cortical cells against H(2)O(2)-induced neurotoxicity.
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