Antimicrobial sesterterpenoids with a unique 5/8/6/5 tetracyclic carbon-ring-system and diepoxide polyketides from a deep sea-sediment-sourced fungus Chaetomium globosum SD-347

Two new tetracyclic sesterterpenoids and two new diepoxide polyketides with antimicrobial activity were characterized from the culture extract of Chaetomium globosum SD-347, a fungal strain derived from deep sea-sediment.