Abstract
Cytochalasins D1 (1) and C1 (2) were isolated from the liquid fermentation of fungus Xylaria cf. curta. Their structures and absolute configurations were determined by comprehensive experimental spectroscopic methods as well as ECD and GIAO 13C NMR calculation. They possess a unique eleven-membered macrocycle with an oxygen bridge. Cytochalasins D1 and C1 showed moderate cytotoxicity against human leukemia cell lines HL-60 with IC50 value of 12.7 and 22.3 μM, respectively.
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