In spite of the fact that carbamic acid is, formally, the simplest amino acid and is, therefore, a potential structural unit of protein molecules, information concerning its peptides is lacking in the chemical literature. We report herewith the preparation and some of the properties of three of the siniplest tripeptides of this new Class, NH8+ CHRCONHCONHCHR'COO-. Hypothetically, these substances might be regarded as formed by the condensation of one ...