《Table 1 1H NMR (600 MHz) and 13C NMR (150 MHz) spectro-scopic data of compound 1 and 2 in DMSO-d6 (

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《Two symmetrical unsaturated acids isolated from Viscum album》

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Compound 2 was isolated as a colorless amorphous solid，the HR-ESI-MS spectrum（m/z 279.1402[M–H]–），suggested the molecular formula C16H22O4.The 1H and 13C NMR spectrum（Table 1）of Compound 2 showed that its structure was similar to that of 1，except for the relative configuration of the vinyl group.In the 1H NMR spectrum of 2，two hydrogen groups of alkenes at 7.66（1H，d，15.6 Hz）and 7.69（1H，d，15.6 Hz）were shown，indicating the presence of trans alkene.Thus，the structure of compound 2 was determined to be（2E，6E）-dibutyl octa-2，6-dien-4-yne dioate（Fig.3）.