Fujenoic acid

6,18-Dioxo-6,18-epoxy-6,7-secokaura-16-ene-7-oic acid

(1R,2S,5R)-6-Methylene-2-[(3aS)-octahydro-4,7aα-dimethyl-1,3-dioxoisobenzofuran-4α-yl]bicyclo[3.2.1]octane-1-carboxylic acid