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The first natural S‐containing benzophenone dimer, named guignasulfide (3), was isolated from the culture of Guignardia sp. IFB‐E028, an endophytic fungus residing in healthy leaves of Hopea hainanensis. Its structure was determined through correlative analyses of its MS, 1D‐ and 2D‐NMR spectroscopic data. Two other known benzophenone derivatives, monomethylsulochrin and rhizoctonic acid (1 and 2,...
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