Original: Apart from the Miller-Urey experiment , described above , the next most important step in research on prebiotic organic synthesis was the demonstration by John Oró that the nucleic acid purine base , adenine , was formed by heating aqueous ammonium cyanide solutions .
Simplified: The next most important step in research on prebiotic organic synthesis was the demonstration by John Oró that the nucleic acid purine base , adenine , was formed by the simple heating of solutions of ammonium cyanide .