2-Butenenitrile, 2-methyl- 2-Methyl-2-butenenitrile 2-Methylcrotononitrile 4403-61-6 CCRIS 6055 Crotononitrile, 2-methyl- (8CI) EINECS 224-544-5 alpha,beta-Dimethylacrylonitrile alpha-Methylcrotononitrile