The molecule is a biaryl that is 5,5',10a,10a'-tetrahydro-9H,9'H-2,2'-bixanthene-9,9'-dione substituted by hydroxy groups at positions 1, 1', 5, 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 activity. It has a role as an antibacterial agent and a fungal metabolite. It is a member of xanthones, a polyphenol, a biaryl and a polyketide.
(4S,4aR)-7-[(5S,10aR)-1,5,9-trihydroxy-3,10a-dimethyl-8-oxo-5H-xanthen-2-yl]-4,8,9-trihydroxy-4a,6-dimethyl-4H-xanthen-1-one