3-(Bicyclo(2.2.1)hept-2-yl)-3-butenenitrile 72928-06-4 Bicyclo(2.2.1)heptane-2-propanenitrile, beta-methylene- EINECS 277-048-6 beta-Methylenebicyclo(2.2.1)heptane-2-propiononitrile