Arthrinins A–D: novel diterpenoids and further constituents from the sponge derived fungus Arthrinium sp - Ebada, S S; Schulz, B; Wray, V; Totzke, F; Kubbutat, M HG; Muller, W EG; Hamacher, A; Kassack, M U; Lin, W H; Proksch, P (Bioorg Med Chem, 2011)