4,7-Methano-1H-isoindole-1,3(2H)-dione, 3a,4,7,7a-tetrahydro-, (3a.alpha.,4.alpha.,7.alpha.,7a.alpha.)- 5-Norbornene-2,3-dicarboximide, cis-endo- 5-Norbornene-endo-2,3-dicarboximide 6265-30-1 NSC31977