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Khanh, P.N.,Duc, H.V.,Huong, T.T.,Son, N.T.,Ha, V.T.,Van, D.T.,Tai, B.H.,Kim, J.E.,Jo, A.R.,Kim, Y.H.,Cuong, N.M. Elsevier 2016 Fitoterapia Vol.109 No.-
<P>Phytochemical analysis of the leaves and stems of Callistemon citrinus (Curtis) Skeels led to the isolation of two new alkylphloroglucinols, gallomyrtucommulone E and F (1 and 2), along with four other known alkylphloroglucinol derivatives, gallomyrtucommulone A (3), endoperoxide G3 (4), myrtucommulone B (5), callistenone B (6) and five known triterpenoids, induding betulinic acid (7), 3 beta-acetylmorolic acid (8), 3 beta-hydroxy-urs-11-en-13(28)olide (9), diospyrolide (10) and ursolic acid (11). The structures of the natural compounds were determined from the spectroscopic evidences including 1D-/2D-NMR and HR-MS spectrometry. All the isolated compounds were assessed for the effects on the sEH inhibitory activity. The acylphloroglucinols myrtucommulone B (5)/callistenone B (6) (in mixture), and two triterpenoids, ursolic acid (11) and 3 beta-hydroxy-urs-11-en-13(28)-olide (9) displayed strong inhibition of sEH activity, with IC50 values of 0.7, 112 and 24.8 mu M, respectively. (C) 2015 Elsevier B.V. All rights reserved.</P>