Error:
C12N5O10SH5 %2B O2 %3D C %2B N2 %2B SO2 %2B CO %2B H2O
^Unexpected character ('%')C12N5O10SH5 %2B O2 %3D C %2B N2 %2B SO2 %2B CO %2B H2O
^Unexpected character ('%')