History...Key time In1828,Fridrich Wohler(魏勒) convert the “inorganic”salt ammonium cyanate氰酸铵into the “organic”su6 stance urea.. With this discovery,organic chemistry was bom. Heat NH4*OCN NH2 NH2 History… Key time ▪In 1828, Fridrich Wohler（魏勒） convert the “inorganic” salt ammonium cyanate氰酸铵into the “organic” substance urea. ▪With this discovery, organic chemistry was born. NH4 + - OCN NH2 O NH2 Heat