Error:
KOH %2B Br2 %2B K2%5BSn%28OH%294%5D %3D KBr %2B K2%5BSn%28OH%296%5D
^
Unexpected character ('%')KOH %2B Br2 %2B K2%5BSn%28OH%294%5D %3D KBr %2B K2%5BSn%28OH%296%5D
^
Unexpected character ('%')