Three New Compounds from the Actinomycete Actinocorallia aurantiaca

Aurantiadioic acids A (1) and B (2), two new furan-containing polyketides, and aurantoic acid A (3), a new natural product, were isolated from the liquid fermentation of the sika deer dung-derived actinomycete Actinocorallia aurantiaca. The structures of the new compounds were established by extensive spectroscopic methods, including 1D & 2D NMR, HRESIMS spectroscopic analysis. The absolute configuration of 3 was assigned by comparison of the specific optical rotations with the reported derivatives. Biological activity evaluations suggested that compounds 1–3 showed weak inhibition on NO production in the murine monocytic RAW 264.7 macrophages with IC(50) values of 35.8, 41.8, 45.2 μM, respectively. Compound 3 showed weak inhibition on influenza A virus (A/PuertoRico/8/1934, H1N1) with an EC(50) value of 35.9 μM, and a selective index higher than 13.3. ELECTRONIC SUPPLEMENTARY MATERIAL: The online version of this article (10.1007/s13659-019-00217-0) contains supplementary material, which is available to authorized users.