How is 2-Aminopropanediamide (CAS: 62009-47-6) typically synthesized?

2-Aminopropanediamide is commonly synthesized by the reaction of diaminopropane with acetic anhydride in the presence of a catalytic amount of sulfuric acid. The reaction typically gives a high yield of the product with good selectivity. The process involves heating the mixture to around 80°C for several hours and then cooling and concentrating the mixture.