Error:
H2O %2B O2 %2B Au %2B NaCN %3D NaOH %2B Na%5BAu%28CN%292%5D
^Unexpected character ('%')H2O %2B O2 %2B Au %2B NaCN %3D NaOH %2B Na%5BAu%28CN%292%5D
^Unexpected character ('%')