Two new asterriquinols from Aspergillus sp CBS-P-2 with anti-inflammatory activity

Two new bisindolylbenzenoid alkaloids asterriquinol E (1) and asterriquinol F (2), together with four known compounds (3-6) were isolated from the fermentation products of the fungus Aspergillus sp. CBS-P-2. Their structures were established on the basis of extensive spectroscopic analysis, including HR-ESI-MS, UV, IR, 1D, and 2D NMR (HSQC, HMBC, and NOESY) methods. The stereochemical structure of 2 was confirmed via the CD data of the in situ formed [Rh-2(OCOCF3)(4)] complex method. All of the isolated compounds were tested for inhibitory activity against LPS (lipopolysaccharide)-induced nitric oxide production in microglia.