The molecule is an azaphilone that is 9,9a-dihydro-6H-furo[2,3-h]isochromene-6,8(6aH)-dione substituted by 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 an azaphilone, an organic heterotricyclic compound, a gamma-lactone and an enone.
(6aR,9S,9aS)-3,6a-dimethyl-9-[(2S)-2-methylbutanoyl]-9,9a-dihydrofuro[2,3-h]isochromene-6,8-dione