1-(Methylnitrosamino)-2-butanone 2-Butanone, 1-((nitrosomethyl)amino)- (9CI) 2-Butanone, 1-(methylnitrosamino)- 89367-14-6 CCRIS 469 M-2-OB N-Nitrosomethyl(2-oxobutyl)amine N-Nitrosomethyl-(2-oxobutyl)amine