Not Less Than - 95%
Carbamic acid, N-(1-cyano-4-pentyn-1-yl)-, 1,1-dimethylethyl ester; 1,1-Dimethylethyl N-(1-cyano-4-pentyn-1-yl)carbamate; tert-Butyl (1-cyanopent-4-yn-1-yl)carbamate