New p-terphenyls from the endophytic fungus Aspergillus sp. YXf3

Abstract Five new p -terphenyls named prenylterphenyllin D ( 1 ), prenylterphenyllin E ( 2 ), 2′- O -methylprenylterphenyllin ( 3 ), 4- O -methylprenylterphenyllin ( 4 ) and 3′- O -methylterphenyllin ( 5 ) together with seven known compounds ( 6 – 12 ), were isolated from cultures of Aspergillus sp. YXf3. The structures of the new compounds were elucidated by extensive MS and NMR analyses. The NMR and MS data of 5 is reported for the first time, as its structure was listed in SciFinder Scholar with no associated reference. Compounds 6 and 7 were distinguished from each other on the basis of 2D NMR experiments. Compounds 1 , 2 , 3 and 8 showed antibacterial activities against X. oryzae pv. oryzicola Swings and E. amylovora with the same MIC values of 20 μg/mL while 10 exhibited activities against E. amylovora with an MIC value of 10 μg/mL.