原始地球条件下的氰胺形成。

Science. 1965 Jan 8;147(3654):149-50. doi: 10.1126/science.147.3654.149.

The dimer of cyanamide, dicyandiamide, is formed upon ultraviolet irradiation of dilute cyanide solutions, and by the electron irradiation of a mixture of methane, ammonia, and water. Thus cyanamide may have had an important role in chemical evolution.

三聚氰胺（氰尿酰胺）二聚体是在稀氰化物溶液的紫外线辐照下形成的，也是甲烷、氨和水混合物在电子辐照下形成的。因此，氰尿酰胺在化学进化中可能具有重要作用。