This image shows some kind of formula that could be converted to TeX . Storing formulas as images makes it harder to change them. TeX also helps making sure that they all use the same font and size.
A replacement has been proposed:

${\displaystyle {\begin{array}{l}{\ce {{R-N=C=O}+H2O->[{\ce {step}}\ 1]R1-{\underset {| \atop \displaystyle H}{N}}-{\overset {\displaystyle O \atop \|}{C}}-O-H->[{\ce {step}}\ 2][{\ce {decomposes}}]{R-NH2}+CO2(g)}}\\{\ce {{R-N=C=O}+R-NH2->[{\ce {step}}\ 3]-R-{\underset {| \atop \displaystyle H}{N}}-{\overset {\displaystyle O \atop \|}{C}}-{\underset {| \atop \displaystyle H}{N}}-R}}{-}\end{array}}}$

In your article, replace the image with:

<math chem>\begin{array}{l}
\ce{ {R-N=C=O} + H2O ->[\ce{step}\ 1] R1-\underset{ | \atop \displaystyle H}{N}-\overset{\displaystyle O \atop \| }{C}-O-H ->[\ce{step}\ 2][\ce{decomposes}] {R-NH2} + CO2(g)} \\
\ce{ {R-N=C=O} + R-NH2 ->[\ce{step}\ 3] -R-\underset{ | \atop \displaystyle H}{N}-\overset{\displaystyle O \atop \| }{C}-\underset{ | \atop \displaystyle H}{N}-R}{-}
\end{array}</math>