Orthosiphol B

Orthosporin ((+)-Orthosporin), a phytotoxic isocoumarin compound, is a microbial secondary metabolite. Orthosporin can be isolated from the endophytic fungus Lasiodiplodia tbeobromae. Orthosporin has potent antibacterial activity against B. subtilis, E. coli and P. aeruginosa. Orthosporin also has antioxidant activity against DPPH radical and antiviral activities with inhibition of HIV-1 reverse transcriptase activity[1].