Versicolactones A-D (1-4), four new butyrolactones, along with four known butyrolactones (5-8) were isolated from the fermentation products of the endophytic fungus Aspergillus versicolor. The structures of compounds 1-4, including absolute configuration, were elucidated by interpretation of the NMR and CD data. Compound 2 was further confirmed by single-crystal X-ray diffraction analysis. In particular, compound 1 is the first naturally occurring butyrolactone possessing an unusual 2-oxopropyl group. More importantly, compounds 1 and 8 displayed significant antitobacco mosaic virus activities with inhibition rates of 46.4% and 35.4%, even more potent than the positive control ningnanmycin (30.8%). Compound 1 also showed moderate cytotoxicity against A549 and MCF7 cells with IC50 values of 3.2 and 2.5 mu M, respectively.
National Natural Science Foundation of China 
; Excellent Scientific and Technological Team of Yunnan High School [2010CI08]
; Yunnan University of Nationalities Green Chemistry and Functional Materials Research for Provincial Innovation Team [2011HC008]
; Yunnan University of Nationalities
1.Yunnan Univ Nationalities, Key Lab Chem Ethn Med Resources, State Ethn Affairs Commiss, Kunming 650031, Peoples R China 2.Yunnan Univ Nationalities, Minist Educ, Kunming 650031, Peoples R China 3.Chinese Acad Sci, State Key Lab Phytochem & Plant Resources West Ch, Kunming Inst Bot, Kunming 650201, Peoples R China