Colletodiol is a fungal metabolite that has been found inD. grovesiiand has immunosuppressant and antiviral activities.1,2It inhibits concanavalin A- or LPS-induced proliferation of isolated mouse splenocytes (IC50s = 12 and 5 μg/ml, respectively).1Colletodiol inhibits influenza A viral replication in HeLa-IAV-Luc cells.2 1.Fujimoto, H., Nagano, J., Yamaguchi, K., et al.Immunosuppressive components from an ascomycete, Diplogelasinospora grovesiChem. Pharm. Bull.46(3)423-429(1998) 2.Lai, W., Wang, S., and Ye, X.Colletodiol inhibits the replication of influenza A virus WSN/H1N1 by reducing the activity of viral RNA polymeraseWei Sheng Wu Xue Bao53(12)1334-1339(2013)