29745-04-8 4,7-Epoxyisobenzofuran-1,3-dione, hexahydro-, (3a-alpha,4-beta,7-beta,7a-alpha)- 5-19-05-00041 (Beilstein Handbook Reference) 7-Oxabicyclo(2.2.1)heptane-2,3-dicarboxylic anhydride, exo- BRN 0084287 Endothall anhydride NSC 59023 Norcantharidin (6CI)