Abstract
A new abietane diterpene, glypensin A ( 1) and four known compounds, 12-acetoxy- ent-labda-8(17), 13 E-dien-15-oic acid ( 2), quercetin 3- O- α- L-arabinofuranoside ( 3), quercetin 3- O- β- D-galactopyranoside ( 4), β-sitosterol ( 5) were isolated from the branches and leaves of Glyptostrobus pensilis (Staut.) Koch. Their structures were determined by MS, 1D- and 2D-NMR means. Compound 1 showed cytotoxicity on human chronic myeloid leukemia cell line K562 (IC 50 = 21.2 μM).
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