4,7-Epoxy-1H-isoindole-1,3-dione, 1,3a,7a-trimethyl- 7-Oxabicyclo(2.2.1)heptane-2,3-dicarboximide, N,2,3-trimethyl- N,2,3-Trimethyl-7-oxabicyclo(2.2.1)heptane-2,3-dicarboximide RN7872500