2-(5-Nitroiminotetrazol-1-yl) acetic acid (4) was synthesized from 100% nitric acid and ethyl 2-(5-aminotetrazol-1-yl) acetate (2), which was easily obtained by reaction of ethyl aminoacetate hydrochloride, sodium hydroxide, and cyanogen azide. Compound 4 was also formed with 100% nitric acid and 2-(5-aminotetrazol-1-yl) acetic acid which was prepared from sodium 5-aminotetrazolate and 2-chloroacetic acid. New energetic materials ...