Application of our chemical screening methodology2) to different new fungal isolates gave rise to the detection, isolation, structure elucidation, and widespread biological testing of a new fungal metabolite named clonostachydiol (1), which is related to the macrodiolides of the colletodiol family3 '4).The producing organism, strain FH-A 6607, was isolated from a soil sample collected near Rantepao, Sulawesi Island (Indonesia) and exhibited a characteristic brown to yellow colored mycelium. The typical conidiophores were found to be in close morphological analogy to gliocladium and are arranged in self-contained long rows (Fig.