4582-18-7 5-Norbornene-2,3-dicarboxamide, N,N,N',N'-tetraethyl-, trans- Bicyclo[2.2.1]hept-5-ene-2,3-dicarboxamide, N,N,N',N'-tetraethyl-, [1R-(2-endo,3-exo)]- Endomid Endomide K 509 K-509 NSC241432 Norbornene-2,3-trans-dicarbonic acid bis-diethylamine Vasadol