Abstract
Sorazolons A (1) to E2 (9) were isolated from Sorangium cellulosum strain Soce375. Their molecular structures were elucidated using extensive HRESIMS and NMR analysis. The absolute configuration of sorazolon A (1) was determined by comparison of the experimental CD spectrum with quantum chemical calculated spectra for both enantiomers. Sorazolons D2 (7), E (8), and E2 (9) exhibit a moderate cytotoxic activity against mouse fibroblast cell line L929 with IC50 values between 5.0 μM and 0.09 mM.
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