Structure Elucidation of the -Polyketide Svalbardine B from the Arctic Fungal Endophyte sp. E1PB with Support from Extensive ESI-MS Interpretation.

Svalbardines A and B ( and ) and annularin K () were isolated from cultures of sp. E1PB, an endophyte isolated from the petals of from Svalbard, Norway. Svalbardine A () is a pyrano[3,2-]chromen-4-one, a new analogue of citromycetin.