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Twenty-one benzoylated phloroglucinol derivatives bearing homoadamantyl frameworks were isolated from the aerial parts of Hypericum sampsonii, including two new ones named hyperisampsins N and O (1 and 2). The structures of 1 and 2 were elucidated by extensive NMR and mass spectrometric analyses. Their absolute configurations were further determined by using TDDFT ECD calculations. Compounds 2, 7,...
Chaetoxanthone D (1), a new tetrahydropyran-substituted xanthone originated from polyketide pathway, together with the four known natural products chaetoxanthone C (2), alternariol methyl ether (3), alternariol (4) and 2,5-dimethyl-7-hydroxychromone (5) was isolated from a strain of Chaetomium murorum. The structures of these compounds were elucidated based on extensive spectroscopic analyses. The...
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