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[摘要]：Three new ent-kaurane glucopyranosides, 2-O-[beta-D-apiofuranosyl-(1 -> 3)-2-O-isovaleryl-beta-D-glucopyranosyl]-4-epi-atractyligenin (1), 2-O-[beta-D-apiofuranosyl-(1 -> 3)-2-O-isovaleryl-beta-D-glucopyranosyl]atractyligenin (2), and 2-O-[beta-D-apiofuranosyl-(1 -> 3)-2-O-(3-methylpentanoyl)-beta-D-glucopyranosyl]-4-epi-atractyligenin (3), along with 2-O-(2-O-isovaleryl-beta-D-glucopyranosyl)-4-epi-atractyligenin (4), were isolated for the first time from the aerial parts of Siegesbeckia pubescens. The structures were established by extensive spectroscopic analyses including 1D- and 2D-NMR (HSQC, HMBC, and ROESY), and HR-ESI-MS, and by comparison with published data. |
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