Error:
Sb2O3 %2B Br2 %2B KOH %3D K3SbO4 %2B KBr %2B H2O
^
Unexpected character ('%')Sb2O3 %2B Br2 %2B KOH %3D K3SbO4 %2B KBr %2B H2O
^
Unexpected character ('%')