The molecule is an azaphilone that is 9a,9b-dihydro-1H-furo[2,3-h]isochromene-6,8(6aH,9H)-dione substituted by a hydroxy group at position 1, methyl groups at positions 3 and 6a and a 2-methylbutanoyl group at position 9. It has been isolated from the culture of the mangrove endophytic fungus Penicillium chermesinum. It has a role as a Penicillium metabolite. It is a gamma-lactone, an azaphilone, an enone, an organic heterotricyclic compound and a secondary alcohol.
(1S,6aR,9S,9aR,9bS)-1-hydroxy-3,6a-dimethyl-9-[(2S)-2-methylbutanoyl]-1,9,9a,9b-tetrahydrofuro[2,3-h]isochromene-6,8-dione