115966-98-8 1H,3H-4,7-Epoxy-3a,7a-propanoisobenzofuran-1,3-dione, tetrahydro-, (3a-alpha,4-beta,7-beta,7a-alpha)- Tetrahydro-1H,3H-4beta,7beta-epoxy-3aalpha,7aalpha-propanoisobenzofuran-1,3-dione