2-((3aR,5R,9bR,10R)-6,9-dimethoxy-2,2,10-trimethyl-3a,4-dihydro-5H-5,9b-(epoxymethano)naphtho[1,2-d][1,3]dioxole-8-carbonyl)cyclohex-1-ene-1-carboxylic acid

3-((3aR,5R,9bR,10R)-6,9-dimethoxy-2,2,10-trimethyl-3a,4-dihydro-5H-5,9b-(epoxymethano)naphtho[1,2-d][1,3]dioxol-8-yl)-3-hydroxy-4,5,6,7-tetrahydroisobenzofuran-1(3H)-one