Error:
K2S %2B K2MnO4 %2B H2O %3D MnO%28OH%292 %2B S %2B KOH
^Unexpected character ('%')K2S %2B K2MnO4 %2B H2O %3D MnO%28OH%292 %2B S %2B KOH
^Unexpected character ('%')