 The compound is stable only up to about 250 K (−23 °C); at higher temperatures it decomposes into those two gases.The solid apparently consists of dimers, with the two molecules connected by hydrogen bonds between the two carboxyl groups –COOH.Carbamic acid could be seen as both an amine and carboxylic acid, and therefore an amino acid; however, the attachment of the acid group directly to the nitrogen atom (without any intermediate carbon chain) makes it behave very differently from those classes.