Communesins G and H, new alkaloids from the psychrotolerant fungus Penicillium rivulum.

Communesins G (1) and H (2), two new alkaloids, have been isolated from the psychrotolerant, new species Penicillium rivulum Frisvad. The compounds were isolated by high-speed countercurrent chromatography and preparative HPLC using UV-guided fractionation. The structures were determined from 1D and 2D NMR techniques and HRESIMS. In contrast to all other known communesins, 1 and 2 were found inactive in antimicrobial, antiviral, and anticancer assays.