A lactone (6-allyl-5,6-dihydro-5-hydroxypyran-2-one) was isolated from a new Drechslera sp. 1H and 13C NMR assignments, not previously specified, are published. No mutagenic activity on Ames/Salmonella test (strains TA98 and TA100 has been observed. Results on the respiratory metabolism of J774.1 murine macrophage indicate that the lactone might exhibit immunomodulating activity as a function of time of cellular contact and of concentration.
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