The molecule is a biaryl that is 5',10a'-dihydro-9H,9'H-2,2'-bixanthene-5,9,9'(10aH)-trione substituted by hydroxy groups at positions 1, 1', 5', 8 and 8' and methyl groups at positions 3, 3', 10a and 10a'. Isolated from the cultures of a Hawaiian isolate of the fungus Phoma species, it exhibits antibacterial and antifungal activities. It has a role as an antibacterial agent and a fungal metabolite. It is a biaryl, a polyphenol, a polyketide and a member of xanthones.
(4aR)-7-[(5S,10aR)-1,5,9-trihydroxy-3,10a-dimethyl-8-oxo-5H-xanthen-2-yl]-8,9-dihydroxy-4a,6-dimethylxanthene-1,4-dione